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No flaws in sheetrock and not smoke damage. It is on every stud and joist and looks like it is coming from behind the paint, not yet on the surface.

I looked at a house to paint (interior) today and it had dark, almost black shadows running along the ceiling joists and they had started to run down the walls following the wall studs. You could see the shadow of the screw/nail heads. This was occurring mainly along the outside walls. This...