How To Bleach Wood With Oxalic Acid

Liquids, like water or pet urine, can seep into a wood floor and leave a brown or black stain. Bleaching the stain with a heated mixture of water and oxalic acid will remove the stain, leaving the natural wood colour. Oxalic acid is also useful to bleach stains on wood furniture, like those caused by a beverage container that left a water ring. Clean the surface to strip waxes and oils before applying oxalic acid to bleach a wood stain.

What You Will Need:

Instructions

1.  Clean the wood thoroughly with wood cleaner and strip all paint and finish down to the bare wood.

2.  Mix the oxalic acid with the recommended amount of hot water. For stains: use 12 to 16 ounces of acid per gallon of water.

3. Apply the mixture liberally to the stain using a brush, mop or rag, depending on the size of the job.

4.  Let the acid dry completely. If the stain remains, continue with further applications of acid, letting it dry completely between stages.

5.  Mix 2 tbsp. of borax for each quart of water and apply to the wood after the stain has been removed or the wood has been bleached to the desired colour. This will neutralize the acid.

6.  Allow the borax to dry. Rinse the floor thoroughly and allow it to dry.

7.  Rub a clean dark cloth over the wood. If there is white powder residue on the floor, rinse with water again and allow the floor to dry.

8.  Sand the wood lightly to smooth it after all remnants of the bleach has been removed.

Tips & Warnings

  • No one wood bleach works with all stains. Look to see which kind of bleach is the most effective for your type of stain. If you are unsure what caused the stain, try oxalic acid first. If it is completely unsuccessful, then consider other types of bleach like an A/B or chlorine bleach.
  • Oxalic acid is available at home improvement or paint stores.
  • If the bleached area becomes greyish-white, rub very fine steel wool over the stain to lift the light discoloration.
  • Using oxalic acid to bleach wood stains is a better choice than household bleach, which can give the wood a greenish-yellow tint.
  • Only use oxalic acid in a well-ventilated area. Keep kids and pets away and wear protective clothing.

Where to Buy Oxalic Acid online UK

Where to Buy Borax

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31 thoughts on “How To Bleach Wood With Oxalic Acid

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  5. pell grants says:

    Thanks for some quality points there. I am kind of new to online , so I printed this off to put in my file, any better way to go about keeping track of it then printing?

    • Michael says:

      Yes if you are on facebook, you could join our facebook page here is a link . As soon as any new articles are published they are posted there. You could also save our home page as a favorite and check in there every now and again to see if anything new is uploaded. Another option would be to subscribe to our rss feed, to do that, there is an orange box at the bottom of the articles with curved lines in it, just click it.

      I hope this helps
      Michael

  6. maria andros says:

    Thanks for the post, keep posting stuff

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