Black Water Marks on Wood


Old 12-28-03, 06:17 PM
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Question Black Water Marks on Wood

We have black water marks/mold stains on our window sashes....does anyone know how to clean them up or make them disappear??
Old 12-29-03, 01:24 PM
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Location: Taylors, SC
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Black water marks are in the wood. Some oxalic acid applied to the stains may halp lift them. If that does not work, you can try chlorine bleach which is stronger.

Oxalic acid is called wood bleach. Mix it in water to form a liquid, apply it for a few minutes and wipe off to see if the effect has been achieved. Reapply as needed. Once finished, rinse the surface thoroughly to remove all traces of the bleach. Otherwise, it will revert to its crystalline form to become active the next time it becomes wet.

Hope this helps.
Old 01-01-04, 08:25 PM
Furniture Bldr
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If you apply oxcilic acid to a finished piece of wood, you will take the finish off. Oxcilic acid is a good way of getting black marks out of Oak. The black marks are Tanic Acid. Thus caused by water and moisture.

Keep in mind, that whatever process you do, it will take off the finish, or destroy it to the point of needing refinishing.

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