Wood bleaching: how to effectively "cure" wood from blue mold? How to whiten wooden log cabins with your own hands How to whiten a log cabin from the outside

In the warm season, from May to October, wood is easily affected by wood-staining fungi. They do not cause special damage to the tree, but the presentation is lost, as the wood turns blue and blackens. In addition, blue creates a breeding ground for wood-destroying fungi. The color of wood in open space also changes under the influence of ultraviolet radiation, first acquiring a yellowish tint, gradually turning into a dirty gray. The problem of fungal stains can arise in sawmilling, when storing sawlogs and lumber, during the construction process, as well as in a built wooden house.

It is especially offensive to the owner of a newly built house - a black log house does not please the eye at all. There are several ways to deal with this sad fact: paint, sheathe with other material (for example, siding), sand or cut off unsightly stains, and, finally, apply chemical bleaching, which will be discussed. Bleaching can be used both in primary woodworking and in wooden housing construction, carpentry and furniture production as well as in the pulp and paper industry. At the same time, the natural color of the wood is restored, and the structure is completely preserved. However, it should be noted that lumber, which will subsequently be subjected to further processing, can only be bleached superficially, when planing and profiling, colors can again appear on its surface. Another thing - wooden house. It will look like new. In the furniture industry, bleaching is used to make the wood surface more light color, leveling the color of the heartwood and sapwood and removing stains. Pulp bleaching is a complex chemical process carried out using a variety of chemicals and process equipment under conditions high temperatures and pressure.

What are wood bleaches?

Conventionally, bleaching chemicals can be divided into two groups: containing chlorine and not containing it. The former include sodium and potassium hypochlorite, bleach, chlorine dioxide. To the second - various salts and alkalis in combination with hydrogen peroxide, oxalic acid, acetic acid, ammonia, ozone.

Active oxygen bleaches work well on aged wood, but are less effective against staining fungi. They do not have bad smell(if they do not contain ammonia) do not require thorough rinsing with water after treatment, but their working solution is viable for a short period of time.

In addition to the main components, the bleach includes substances such as stabilizers that slow down the decomposition of bleaching components, fungicidal additives, agents that improve the penetration of the solution into the wood, catalysts, thickeners and surfactants ( detergents). Fungicidal additives serve to protect against fungi and mold after bleaching, agents and catalysts themselves do not participate in bleaching, but help the bleach to penetrate to the pigments. Thickeners allow a greater layer of the bleaching composition to be applied to the surface of the affected wood, and surfactants help flush out contaminants.

How is wood bleaching done?

When wood is treated with bleaches, the pigment bonds of lignin are discolored due to the destruction of chromophore groups and the discoloration of the cells of wood-staining fungi.

When is wood bleaching necessary?

In wooden housing construction, the need for bleaching may arise as a result of improper storage of the material, in warm and humid weather, in conditions of unventilated timber.

It is impossible to plan the defeat of wood, it can occur at any time during the construction of the facility. It is desirable to carry out bleaching immediately after detecting the color of the tree in an uncharacteristic color.

The need to bleach sawn timber usually arises for two reasons: damage to the sawlog stock and damage to the sawn timber.

In the first case, the need for bleach can be determined, but in the case of lumber, such a need cannot be planned, it arises as the problem is identified.

Both builders and lumber makers are among the most frequent users of bleach. This is sometimes due to purely economic considerations, because the cost of blue-affected lumber is $ 80 per 1 m, and the cost of high-quality lumber reaches 250 euros per 1 m. deep to bleach the wood throughout its thickness, and is about 2 mm.

Another thing is bleach treatment finished products, such as rounded logs or joinery. The need for bleaching arises if you need to cover them transparent formulations, lighten the general background or remove stains. The requirements for the surface of joinery are high, so the bleaching composition should not destroy the structure of the tree, impair adhesion, while the action of the composition must be gentle in order to preserve the natural pattern.

What is required of wood bleachers?

Bleaches used in sawmilling, house building and carpentry must have some necessary properties. The composition should not destroy the wood. Should be easy to prepare and apply.

Of course, the natural color of the wood must be preserved. The necessary properties also include the preservation of the possibility of applying after bleaching tinting coatings, adhesives and transport, as well as preservative antiseptics. The bleach must be safe.

It should be taken into account that bleaching is not a protective measure and the affected wood, after restoring the natural color, can be again affected by wood-staining fungi.

Regina BUDARINA

If the wood has lost its attractiveness appearance, then it can be given a second life by bleaching the surface. There are many options for this, among which, for example, chlorine. These substances are available and inexpensive, so you can use them at home.

Chlorine bleaching: preparation of tools and materials

Wood bleaching can be done with chlorine, and you must prepare:

• crystal soda;
• sodium hydroxide;
• bleach;
• water;
• perhydrol.

Speaking of the last point, it is worth noting that for the work you will need a 30% hydrogen peroxide solution. It should be remembered that such work must be carried out with gloves.

Carrying out bleaching

Wood bleaching should be carried out according to a certain technology. To do this, prepare a special solution of eight shares, which must be mixed with one share of salt, adding 35 parts of water. The resulting mixture is mixed and the solution is allowed to brew, only after that you can start processing the wood.

The second option would be to prepare a solution for which 48 grams of the chemical is mixed with water in a volume of 100 grams. A solution of caustic soda must be applied to the surface of the tree, which is then dried. Sometimes home craftsmen process wood with perhydrol, it is final stage dried, and if bleaching was insufficient, the procedure can be repeated. In order to neutralize this area, rinse it with a 4% solution acetic acid and then dry well.

Wood bleaching is sometimes carried out using hydrogen peroxide, as well as ammonia. "Hydroperit" in tablets is diluted with water: 10 tablets per glass of water (200 ml). Whereas 5 percent is added in a volume of 25 milliliters (its smell should be well felt). The wood must be soaked in this solution and left for several days, while the effect is to be expected that the surface will turn completely white.

The use of peroxide, although effective, is not suitable for all types of wood. For example, oak may not change color after treatment, while this method is ideal for bleaching walnut, birch and beech. It is important to use the correct one, which should not be less than 30%. The surface must be moistened before application. warm water and cover with 5% ammonia. After bleaching is completed, the surface is cleaned with a mixture of bleach and soda ash. For 15 grams of lime, add 3 grams of soda and 100 grams of water.

Uses of oxalic acid

Do-it-yourself wood bleaching can be done using oxalic acid, but such work is carried out with great care. This is due to the fact that the desired effect can be achieved only with the correct percentage of the components. To do this, prepare a 10% solution of oxalic acid and sodium hydrogen sulfate at a concentration of 20%. Sodium hydrosulfate is applied to the surface at the first stage, and then a solution of oxalic acid is applied. After 5 minutes, the compositions are washed off with water.

The nuances of the work

Wood bleaching can be carried out according to different technologies, however, at the final stage, all products must be washed off the surface. If you decide to use acid bleach, then wash it off with an aqueous solution. Bleaching agents cannot be combined. Glued products are not recommended to be subjected to such processing, as they may disperse. If you want to bleach pine wood in a short time, then the surface can be treated with a solution of sulfuric acid (taken in the amount of 20 grams), sodium peroxide (in the amount of 25 grams) and oxalic acid (in the amount of 15 grams). Liquid is added in a volume of one hundred grams.

Using the means "Akrylit 153"

Whitening wood with whiteness is considered very effective, but alternative solutions can be used, such as Acrylit 153. This agent is specially designed for darkened wood and is able to remove microorganisms without interfering with the breathing of the material, and without destroying its structure.

The substance does not affect the strength, adhesion and porosity of the surface in any way and does not change the smell of wood. What cannot be said when wood is bleached with whiteness, the proportions, by the way, do not need to be observed. To carry out the work, it will be necessary to moisten the sponge in the solution and apply the composition to the surface.

But as for "Acrylite 153", it must be diluted with water before use, using a ratio of one to one. If the wood is damaged severely enough, then it is not necessary to dilute the agent; the composition should be applied to the surface with a roller. If whitening seemed to you not too intense, then you need to repeat the procedure after five hours. It is noteworthy that this tool can even be used to bleach pine.

Additional solution

On sale today you can find the tool "Valkor", the cost of which is 1800 rubles. Its tinting is carried out in five minutes. You can use an alkyd-oil stain, which is almost odorless, but helps to bleach the wood to an almost white state. Among the ingredients of the mixture there are antiseptic additives, so the wood stain after finishing the wood can not be covered with anything. As practice shows, this tool perfectly whitens birch, and even under varnish on water based the surface remains visibly brighter.

Sometimes experts use paint based on oils and waxes Decorwachs Deckend. It has a transparent structure, and after coating the wood, only the texture remains visible. Gradually, streaks of material appear on the surface. On sale you can find oil with hard wax, which, when applied, allows you to form a pinkish shade of oak. If we are talking about pine, then it will simply turn white, leaving the texture. The coating is applied in two layers, and then coated with a colorless oil with hard wax. The result is a silky smooth surface. After coating, the wood not only brightens, but also becomes harder, which is possible due to

Conclusion

Wood bleaching with chlorine, like each of the above options, is an effective way. Which technique to use is up to you, it all depends on the budget and your own preferences.

It is with deep regret that I inform you that you have landed on a blue page. And this blue must be urgently removed from the beam of your log house - how bleach timber! Unfortunately our warm, beautiful, natural wood(more precisely, wood) is prone to decay and can deteriorate under the influence of fungi and mold. Blue on a beam or log, on boards or lining - the result of improper storage or preservation of wood products.

Distracting from the topic of direct bleaching of wood, let me remind you that this matter must be stopped at all stages of processing the wooden parts of a wooden house. Immediately after harvesting trunks (transport conservation), during storage (temporary conservation) and after the manufacture of crowns or installation of walls (antiseptic and finishing painting)

How to bleach wood, depends on what damage the details of the log house received. Usually blue is thrown on fresh damp wood even before the final processing of parts. It is during storage with poor ventilation that the fungus begins to spread as quickly as possible. They can only help.

Causes of blue wood products:

Conclusion: in order not to bleach the wood of the wooden parts of the bath or house in the future, it is necessary to use construction chemicals at each stage of construction.

Wood bleach

In the old days, in order not to bleach the tree, they sometimes added salt! This delayed for some time the process of the appearance of a fungal infection.

One of the oldest ways to bleach wood with household chemicals– use of means for bleaching of linen. Alas, there is no difference - where this mold settles, so the methods of struggle are the same. "Whiteness" is a means of housewives. But it can save at the initial stage the defeat of the upper layers of the board or log. If the blue begins to turn into black, then one pass of the brush is not enough.

For more effective whitening wood, it is necessary to prepare it for this process, namely: smooth surface loosen so that the agent for the destruction of mold and fungi gets as deep as possible. Therefore, many masters recommend using Sagus before whitening. Chlorine wood bleach « Sagus", according to the manufacturer cope with any lightening and restore the natural color. But where is the line that separates the natural color of the tree from the dead whiteness?! To be precise, chemical bleaches do not really remove color from wood. As a result of the reaction with the chemicals that make up the blue stain, the bleach forms another substance, the color of which is far from blue or black. Therefore, it is extremely important to ensure the absence of any kind of protective coatings on the surface of parts in the form of paints, varnishes, emulsions, fats, etc. Translucent azure well "broadcast" blue even through itself. Therefore, it is impossible to simply cover a blackened log with paint: 1) it will still be visible through the varnish, 2) it is fraught with deep damage to the log house or timber.

Some "kulibins" recommend such a brutal method how to whiten a timber frame and get the original look of the tree - treat the surface hypochlorite. They argue this by the fact that all other preparations of modern chemistry contain this substance. I personally don't like such methods - they can lead to the fact that wood can get a chemical burn and lose its aesthetic properties. In concentrates created at factories, stabilizers are added that prevent the destructive effects of chemical compounds. Limit the depth of their penetration and stop the activity after a certain exposure time.

I would not discount such a complex method of bleaching a log or timber as grinding, which removes the damaged layer deep enough. But this method is the most expensive, does not guarantee cleaning of fungus and mold in the corners where grinding wheel won't be able to reach. recommended for very deep lesions of wood, when by chemical means it is not possible to remove all foci of blackening and blueness

Factory spill wood bleaches - they know how and know how to bleach the beam of your log house of a wooden house.

"White"	Laundry detergent Folk remedy when nothing is at hand
"Sagus" ( Sagus LLC)	Wood bleach
	No comments. Folk remedy Test before use!
	wood reclaimer. it is necessary to dilute the drug with water in a ratio of 1: 1
	Bleach TM "Neomid" After application, a plaque remains in the form of salt crystals, which must be washed off with water.
BioShield	Means of protecting wood from decay and in combination - Bleach
Senezh EFFO or Senezh NEO	For fast deep or superficial lightening of wooden surfaces that have darkened as a result of fungal stains.
	Concentrate for the production of water-based bleaching compositions
WoodMaster Frost	Whitening and protective compound. Whitening and protective composition for wood. Removes blue, rot, mold

All chemicals included in wood bleaches generally contain substances that are not safe for health and can be dangerous if used improperly. Be sure to take steps to protect yourself from contact with such substances and try not to inhale their vapors. Wear gloves and goggles. If necessary, use a gas mask (not a respirator)

Before bleaching - consult with experts in How to bleach timber.

The best bleaches are those that do not destroy lignin - the basis of wood.

Whitening is best done for the entire surface of the wall so that individual wall logs do not look like white crows in the design.

Using too much chemicals can "kill" wood texture and shades, turning them into plastic sticks.

The air temperature during bleaching is not lower than 5 degrees Celsius, so that the reaction proceeds intensively.

So you built your wooden house. One wants to admire them: the natural texture of wood, a pleasant color - everything is new and fresh. Unfortunately, over the years, its appearance will deteriorate - Sun rays, mold and "blue" will eventually make the walls change color.

Wood bleaching is a simple and reliable way to return the walls of a house to their original appearance. True, its effectiveness is determined by the depth of the lesion: if it exceeds 3 mm, the composition will not be able to penetrate inside.

Blue is a defect in wood, as a result of which it changes its color to blue-gray and bluish. The cause of the defeat is marsupial fungi. Blue does not affect the strength of the walls of the house, but greatly impairs the aesthetic qualities. In addition, marsupial fungi can damage protective coatings causing the wood to rot.

The principle of wood bleaching

All wood bleaching products work on the same principle: they cause an oxidation process, as a result of which the pigment colors of lignin (a substance that characterizes the stiff walls of plant cells) become discolored, and fungal cells are destroyed. Reactive oxygen radicals are responsible for whitening.

Whitening compositions are divided into containing chlorine and not. The first contains: potassium hypochlorite, sodium hypochlorite, chlorine dioxide and bleach. In chlorine-free formulations, the active substances are: hydrogen peroxide, ammonia, salts, alkalis and oxalic acid.

Do-it-yourself wood bleaching

Faced with the problem of changing the color of the walls of the house, many decide to deal with it on their own. For this, inexpensive and available fluids for bleaching wood - hydrogen peroxide and oxalic acid.

Wood bleaching with hydrogen peroxide is simple and effective method. But it does not work on all types of wood. For example, oak peroxide does not bleach, but even changes its color. But for bleaching birch, beech or walnut, it is ideal. Proper Concentration chemical solution- not less than 30%. Before applying the walls of the house are moistened with warm water and covered with a thin layer of ammonia (10%). After the bleaching procedure, it is necessary to clean the surface with a mixture of soda ash and bleach. For 15 grams of lime, you need to take 3 grams of soda and 100 grams of water.

Bleaching with oxalic acid is done with care. The fact is that the desired effect can be achieved by mixing all the ingredients in the correct percentage. You will need 10% oxalic acid solution and 20% sodium hydrogen sulfate solution. First, sodium hydrosulfate is applied to the surface, then a solution of oxalic acid. After five minutes, the compositions must be washed off the surface with water.

Another way is bleaching wood with whiteness. However, when working with whiteness, you must follow safety rules: work with gloves, protect your eyes.

"Hoarfrost" for bleaching wood - more modern facility, returning the walls of the house an attractive look. To work with Frost, you must follow the safety rules: put on a protective suit, wear a mask or goggles, and rubber gloves.

Whitening rules

As you understand, bleaching wood at home is not an easy task. However, if you still decide to do it yourself - follow the rules.

1. Whatever product you use, rinse it off with water after application.
2. If you use acid bleach, wash it off with an aqueous solution of soda.
3. Do not combine different bleaching agents on the same surface.
4. Do not bleach glued products, they can come apart.
5. Want to speed up the process? Treat the surface with a solution of sulfuric acid (20 grams), sodium peroxide (25 grams), oxalic acid (15 grams) and water (1000 grams).

Alternative method

You can do all of the above steps yourself or turn to the pros. To bleach darkened wood, we use Acrylite 153. It restores the natural color, effectively removes microorganisms, does not interfere with the "breathing" of the tree, does not destroy its structure, does not affect adhesion, strength, coloring and porosity, does not change the smell.

Acrylite 153 is diluted with water in a ratio of one to one (in cases of severe damage to wood, it is not diluted) and applied to the walls with a roller. If necessary, after 5 hours the procedure is repeated. The product is suitable for bleaching pine wood.

In order to extend the life of wooden products, you need to take care of their safety in advance. A necessary tool for processing wood parts will be bleach.Wood bleach - which is better to chooseand what are the selection criteria?

In contact with

But along with the positive points, there are several negative ones: the tree is easily affected external factors, from this the surface changes color, naturalness is lost. Using wood bleach will help maintain the original look. wooden structures and extend the operating time.

What are wood bleaches and why are they needed?

Wood bleach is a product that has a certain chemical composition, which allows you to whiten wood details. Bleaching occurs due to the oxidation of the material, which acts on the pigment of the wood. Also, the drug destroys the cells of fungi that managed to hit the surface.

The composition of means for protecting wooden structures is very diverse, there are a great many of them on the market. Prices also vary, but it cannot be said that quality depends on cost. For purchasebest bleach it is worth consulting with experienced people, otherwise there is a risk not only not to protect, but also to spoil wooden buildings. It is necessary to take into account many subtleties in order to obtain the desired result after using the drug.

Attention!It is important to know the type of wood and its density, as well as the moisture conditions under which the processing will be carried out.

What leads to a change in the natural color of the tree

Tree - natural material which is influenced by many factors. It is necessary to treat these products with care so that they continue to delight with their beauty. Wood tends to change color over time, due to several reasons:

1. Influence of direct sunlight. Under open UV rays, a photochemical reaction occurs, which leads to a change in color. Most often it becomes yellower.
2. Reproduction in a wooden array of microorganisms. These include fungi, for which favorable condition will be a humid environment. From fungi, the tree acquires a blue tint.

Depending on the breed, the product may have different shade after several years of use:

• oak becomes golden;
• dark ash - brightens, light ash - turns yellow;
• the nut becomes redder.

It should be understood that getting rid of the fungus at the beginning of the lesion is easier,how to bleach wood from bluein a neglected state, as the microorganisms are very resistant even to aggressive methods of control.

What preparations are suitable for bleaching wood

There are different bleach formulations on the market, but everything can be classified into two main groups: with and without chlorine. Considering them separately, you can find the pros and cons of both types of funds.

Both options are harmless. In both cases, a complex chemical process takes place to bleach the wood.

In preparations with chlorine, the active substance is chlorine alkali, and in another version, hydrogen peroxide, to which ammonia, alkali and a weak acid were added.

In terms of price and economy of use, both options also differ. With chlorine, products are more expensive and not as economical in consumption.

Neomid - bleach for woodthe best category, according to customer reviews. The price of the product is low, which makes the drug affordable. The consumption of the product depends on the degree of damage to the material: the stronger - the more concentrated the solution. On average - 200 g / 1 sq. m.

Application Features:

• at a temperature of 5 degrees and above: when used indoors, an exhaust hood is required, outdoors can be used without fear;
• if at clarification of woodsalt came out, it can be easily removed with plain water;
• important to carry out before bleaching softwoodsderesining wood,otherwise it won't work desired effect from Neomid-500.

Homeenpoisto

Also applies to bleaches good quality, the manufacturer is the well-known Tikkurila. Refers to drugs of economical use, enough for a large area.

Application Features:

• can be applied to painted wood - the effect will be noticeable;
• bleaching time depends on the degree of damage to the surface. Weakly affected material is covered with liquid for half an hour, then it is required to wash it off. The time is increased if necessary.

- a drug of domestic production, created on a water basis. It is produced in large containers, consumption - 130 g / 1 sq. m. He copes with his work no worse than foreign counterparts. The price is much lower than others.

Application Features:

• before applying, you need to clean the tree from the villi for better penetration into the liquid, this will also reduce the consumption of the product;
• for a visible result, "Sagus" is applied for 2.5-3 hours, then washed off.

Fongifluid Alpa

A French-made drug that has proven itself very well. Although it has a high cost, it copes well with any difficulties. Consumption - 1 l / 4-5 sq. m.

Application Features:

• Fongifluid Alpha is not only excellentwood bleaching agent. It can remove impurities from natural stone, tiles, ceramics;
• has the effect protective film, prevents mold infestation for at least two years;
• when bleach is applied, the adhesion of the surface increases, so that with further painting there will be less costs, and the paint will last longer.

Senezh Effo

This drug will definitely help, if you are thinking,how to lighten wood. It copes well with discoloration, with fungal infections, removes various surface lesions. The consumption of funds is an average of 150 g / 1 sq. m.

Application Features:

• the material does not require salting out after processing;
• the result is stored for a long time;
• treated wood is not dangerous for people and animals;
• Bleach is not flammable.

When comparing the two most commonly used wood bleaches -Senezh or Neomid, which is better in use - it is impossible to answer unambiguously.

The two drugs have different characteristics that are important in certain situations.

Comparing the consumption of funds, it can be noted that Senezh is more economical to use.

After bleaching, no additional processing is required. wooden product, which cannot be said about Neomid-500. The latter is produced in the form of a concentrate, which allows you to increase the force of impact on the material.

• Before bleaching it is important to know tree species because they all respond differently to this procedure. Worth a try first chemical agent on a small inconspicuous area, and then, with a positive result, cover the entire surface. Trees that do not respond well to bleaching are chestnut and rosewood. Birch and oak belong to the opposite group.
• Bleach - strong Chemical substance, which must be diluted and applied according to the instructions. Each new layer must be applied with a clean brush wearing protective gloves.
• bleached woodafter the procedure, it is necessary to wipe with a weak vinegar solution.

Necessary tools and materials

Chlorine can be used todo-it-yourself wood bleaching. To do this, prepare the necessary components:

• water;
• sodium hydroxide;
• salt in crystals;
• bleaching powder;
• work gloves;
• container for dilution of the bleaching agent;
• brushes for application.

The surface itself needs to be sanded, completely rid of bumps and wood fibers so that the bleach penetrates well inside.

Whitening step by step instructions

Many are wonderinghow to bleach woodwith the help of chlorine. There is nothing complicated in this, the main thing is to follow the instructions completely.

The first version of the remedy: mix eight parts of lime with a part of salt, diluted with 35 parts of water. The mixture is allowed to brew, constantly stirring, only then applied to the surface.

The next option is a mixture of caustic soda and water at the rate of 48 g / 100 g. The coated material is dried, only then in both cases it is wiped with a weak solution of vinegar.

Application of oxalic acid

To bleach wooden surface at home, some use a solution of oxalic acid. But this method is quite complicated in the sense that you need to know exactly the proportions of the ingredients included in the composition.Incorrect preparation of the concentrate can not only not bleach, but also lead to damage to the wood.. It is worth taking 10% oxalic acid and 20% sodium hydrogen sulfate. Sulfate is applied first, then oxalic acid is applied with another brush. This method is good because it is simple and very fast. It is necessary to take only a 5% aqueous solution of acid.

The nuances of whitening

It does not matter which bleaching method was used: at the end, it is necessary to wash the surface in order to neutralize the solution. If an acid bleach was used, then warm water is taken for rinsing. When using an alkaline substance - an acid solution.

Attention!You can not use combined methods - they cannot be washed off.

Wood products that have glued parts should not be bleached as they may come off.

The use of the drug "Akrylit 153"

Another method -wood whitening- very effective, but outdated. Today he has an alternative - "Akrylit 153".

This substance is specially created for the treatment of wood surfaces that have lost their color, have been damaged by microorganisms.

This bleach does not destroy the integrity of the tree, does not leave an unpleasant odor, unlike whiteness.

Whiteness does not need to be mixed or diluted with something: just moisten a rag and wipe upper layer wood. "Acrylite 153" is diluted with water in a ratio of 1:1 before use.

If severe damage is observed on the tree, then the product should not be diluted with water. Perhaps the first time you won’t get the right shade, then you should try again after 6 hours.

If you don't knowhow to bleach pine at home, then take this preparation, it fits well on this type of wood.

Description of floor bleaching with hydrogen peroxide

Sometimes performedwood bleaching with hydrogen peroxideand ammonia. Peroxide in the form of tablets is dissolved in a proportion of 10 pieces / 20 ml of water. Ammonium chloride is added in a volume of 25 ml. The floors are wetted with this mixture and left for a while. The method is suitable for walnut, birch and beech.

The main thing is to be sure to work in a respirator, especially indoors, so that poisoning does not occur when applying the product. If you need to bleach in a short time, you can cover the wood product with a mixture that includes sodium peroxide, sulfuric acid and oxalic acid. Proportions: 25 g / 20 g / 15 g. It is diluted with 100 g of water. The resulting mixture is distributed over the surface for a short time, then washed off with water.

Each of the considered methods is quite effective, helps to achieve the desired result, the main thing is to understand the intricacies, choose correct method according to the type of wood.