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Old 4/25/18, 1:30 PM
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rcooke rcooke is offline
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Join Date: Aug 2003
Location: Brighton, ON
Posts: 27,529
Default Re: Mystery Black Substance: Not Mold, need help !

Have seen it frequently . Its called ghosting .

ghosting in the house - Google Search

Last edited by rcooke; 4/25/18 at 1:43 PM..
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