In a glass or plastic container, dissolve an ounce of oxalic acid into a pint of warm water. Make certain that you have removed all the offending metal before you bleach the wood. Sometimes stains are caused by broken- off nails or bits of fencing that are hidden in the wood. Wet the surface with the oxalic acid mixture and let it dry. Repeat if the stain is not completely gone. Once dry, sponge the wood with plenty of clean water to remove the crystalline residue. Any oxalic acid residue left in the wood will make irritating dust when you sand, so wear a dust mask and eye protection.
Oxalic acid dissolved in water removes black iron stains like magic from tannin-rich wood like oak. Maple is prone to a particular type of blue stain that is caused by mold during the drying process. You can buy percent peroxide solution from a chemical supply company, or borrow it from your box of two-part wood bleach.
Flood it onto the maple with a foam brush and let it dry completely. There is no need to wash it down, since peroxide H2O2 neutralizes itself to water and oxygen.
This story originally appeared in American Woodworker April , issue Here are some supplies and tools we find essential in our everyday work around the shop. We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality. By American Woodworker Editors. Bleaching Wood Subtract color to add life. Consider using bleach as a first step towards a final product, especially since bare bleached wood is susceptible to everything from scratches to water damage.
Whatever finish you choose will protect your piece and make it pop with new life. Disclosure: BobVila. You agree that BobVila. All rights reserved. Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. More From Bob Vila. Newsletter signup: You agree that BobVila. It is also useful in removing rust on various surfaces.
The stains on the counter, bathtub and kitchen sink can be removed by carefully using this chemical. Today, it can be found as a passive component in various cleaning products, bleach, and detergents. This acid is sometimes used in mineral processing. Its bleaching properties can be used to sterilize equipment in some corporate environments. Woven factories and factories use it to bleach the fabric dyeing stage. Healthcare companies sometimes use acid to clean certain chemicals or dilute them.
Acid oxalic can be used on various spots of furniture such as dark watermarks. It may be used to remove stains in larger areas of wood like floors and decks. To know more techniques to have good painting appearance on the wood surface, learn more here.
Oxalic acid is toxic and you should use it with care. Its d better for you to use eye protection, protection clothes, and rubber gloves clothing when using oxalic acid and dispose of it in accordance with local regulations. When being used properly, this chemical is effective in renewing wood into a nice natural state. Always remind to use protective clothes and tools when using acid oxalic.
Source: hunkercdn. Follow these following steps to use oxalic acid as wood bleach, where to buy oxalic acid we will study at the next part. Mix the oxalic acid or flour with the appropriate amount of hot water. For stains, use 12 to 16 ml of acid per ml of water or use from 3 to 5 ml of acid. Note, slowly pour acid into water and stir. It is formulated to remove the natural colour from bare wood, lighten the colour of stained wood, and remove the greying effect of wood that has been exposed to the elements.
Prior to working on your main project, it is always advisable to TEST the product on a scrap piece of the same species of wood. Make sure all surfaces are completely dry and free of grease, oil, wax or any finish. Use a plastic drop cloth to protect all areas surrounding the working surface.
Sand all wood surfaces in the direction of the grain with either a Circa Finishing Pad coarse or sand paper grit. Remove all dust from the wood surface using compressed air or vacuum.
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