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What causes black soot and ghosting on the ceiling?

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Wiki User
May 03, 2005 9:58PM

Ionic air purifiers. They charge or magnetize the particles and then they cling to everything. Remove a picture from the wall - is the ghosting around the outside? Remove a metal decorative piece - if the particles are magnetized the ghosting will be the opposite - it will be in the same design as the item.