'Ghosting' rears its head after paint job

DEAR BARRY: I painted the inside of my home only six months ago, and already it needs to be repainted. Portions of the walls have become visibly darkened. Strangely, this occurs wherever there are framing members behind the drywall. I can see where all the wall studs and ceiling joists are located. Not only that, I can see dark spots where all the drywall nails are located. What could be causing this, and what can I do about it? --Bill

DEAR BILL: What you are seeing is a phenomenon commonly called "ghosting." When ghosting occurs, extremely fine soot particles in the air collect on the walls and ceilings at locations where the temperature is cooler and where there is higher electrostatic attraction.

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