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Expert's Corner — black

TIP: Removing Black Watermarks

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TIP: Removing Black Watermarks

There are two types of watermarks on furniture: white and black. White marks are in the finish and can usually be removed by rubbing with an abrasive. Black marks are stains in the wood and can usually be removed with oxalic acid, but only after the finish has been removed first. Oxalic acid is a type of bleach. It’s not the same as household bleach or two-part bleach (sodium hydroxide and hydrogen peroxide), which is sold in separate containers. Household bleach will remove dye stain but not black watermarks. Two-part bleach will remove black water marks but also all the natural color from the wood, which you rarely want to do. The accompanying before-and-after...

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