Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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This is only a possibility.
In some areas of the country, tap water contains iron. Rare earth magnets would concentrate the dissolved iron. Iron reacts with tannin in some woods to produce a black stain. The stain is especially strong in red oak, I have no idea whether your veneer contains tannin. When working with red oak, one tries to minimize the staining by using distilled water.
You could test for tannin by soaking for a couple days steel wool in a bit of water, then wipe the water over some red oak as a control and over a piece of your veneer.
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