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oxalic acid


Posted by bobsbuddy on May 19th, 2008 07:09 PM
In reply to Black stain removal on hardwood flooring? by maxieweaver48 on May 19th, 2008 09:21 AM [Go to top of thread]

If it's oak, or another wood rich in tannins, what you need is oxalic acid. Unfortunately, it also requires stripping (sanding) first, and refinishing.

http://antiquerestorers.com/Articles/jeff/using_wood_bleach.htm

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