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I am wondering if the paint contractors painted my new drywall appropriately. It is a flat latexand if even brushed with a damp towel it darkens. It seems to me that the drywall must not have been sealed properly for water to be absorbed like that. Can you advise me?

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Assuming the paint returns to the original color once dry, this is perfectly normal with flat latex paints. When I wipe my walls, the spots that I wipe look darker too.

You can observe this on many surfaces, even inpermuable ones like glass and metal - ever notice that your cars paint looks different when there are drops of water on it?

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Mine look lighter with dark colors. Always happens when grabbing a towel with wet hands. – Evil Elf Jul 5 '12 at 12:17

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