Dark round pigmented areas

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Q: I have sanded my old pine floor boards and finished with water based lacquer. Around the floor nails I am noticing dark round pigmented areas. Is this normal with reclaimed floors or is it because I used water based lacquer? I think maybe this is oxidation from the nail?

A: It sounds like a reaction of your finish with tannins in the wood. There are water based sealers designed to block such.

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