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I believe that is stachybottrus[Sp?] , a toxic mold . This is the type found in dark , damp places. If you are referring to fireplace soot, or that black dusty stuff that can grow on citrus fruit , they can still cause respiratory problems. If it's on the structural part of your house, better have a TRUSTED professional have a look, and the sooner the better.

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14y ago

What else can I help you with?