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Colourless Powder Form.
CAS Number: 144-62-7 (anhydrous); 6153-56-6 (dihydrate)
Other names: Wood bleach
Mainly used for cleaning or bleaching, especially for the removal of rust (iron complexing agent)
Oxalic acid is a strong dicarboxylic acid occurring in many plants and vegetables, usually as its calcium or potassium salts. It is readily oxidized. It appears as colourless transparent crystals at room temperature. Spinach, amaranth, water spinach, mustard, black fungus, leek, swamp cabbage, onion, water bamboo and bamboo shoot have a high oxalic acid content. Tea, grapes, peanuts, cocoa, soil bean, soybean, plums and rice also contains a small amount of oxalic acid while cucumber, pumpkin, watermelon and towel gourd, etc does not contain oxalic acid at all. Oxalic Acid is poisonous and harmful to human body.
1. It can be mainly used as reducing agent and bleaching agent, mordant for dyeing and printing industry, also used in refining rare metal, the synthesis of various oxalate compounds.
2. Used as laboratory reagents, chromatography analysis reagent, dye intermediates and standard material.
3. Oxalic acid is mainly used for producing drugs such as antibiotics, etc. Usage
An impurity of oxaliplatin which is a coordination complex that is used in cancer chemotherapy.
4. As a Cleaning Agent
Oxalic acid is an ideal chemical for cleaning purposes. Its bleach-like qualities maeke it perfect for sterilizing household items. It is also efficient in removing rust on various different surfaces. Today, it can be found as a passive ingredient in various cleaning products, bleaches and detergents. Textile mills and factories use it for bleaching in order to color cloths. Medical companies occasionally use the acid to purify certain chemicals or to dilute them further.
Oxalic Acid is highly toxic to the body due to its bleach-like and corrosive properties. As dust or as a solution, can cause severe burns of eyes, skin, or mucous membranes. Ingestion of 5 grams has caused death with symptoms of nausea, shock, collapse, and convulsions coming on rapidly. Repeated or prolonged skin exposure can cause dermatitis and slow-healing ulcers.
To avoid the formation of stones, avoid taking food of high oxalic acid content and foods of high calcium content at the same time such as spinach and soy product, milk containing high content of calcium are food combinations that can easy results in the formation of calcium oxalate.
Oxalic Acid Wood Bleach
Bleach Bare or Uncoated wood.
Remove black water spots and tannin stains.
Gently lighten wood tones darkened by age or finish.
To remove stains:
Dissolve 60g to 120g of oxalic acid crystals into 1L of hot water.
Use solution while hot, with a scrub brush.
Apply liberally allowing solution to remain on surface until desired lightness has been achieved.
If solution cools before job is finished, reheat solution (do not boil).
Triple rinse thouroughly with clean water and allow to dry.
When completely dry, lightly sand the surface. Surface must be clean and completely dry (not just surface dry) before refinishing.
Incomplete drying and retained subsurface moisture can cause finish adhesion failure.
After Stripping and to Lighten:
To restore wood tones (especially for oak) - Restore clarity and the natural tones of the wood without effecting the patina.
Use 3 to 5 oz. per gallon of hot water then apply by spray, brush or wipe on.
Rinse thoroughly with clean water.
DO NOT INTERMIX OXALIC ACID WITH ANY OTHER PRODUCT.
Mix With Water Only!
Protect eyes with goggles.
Wear rubber gloves.
Protect Skin from splashes.
Wood must be clean; free of paint, waxes, oils,and dirt.
Use wood cleaners to remove any grease oils or grime. Use paint strippers to remove any finish, paint, or coating.
ALWAYS test results in an inconspicous area, dilution may need adjusting for desired results.
Difficult stains may need repeated application.