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What is black powder, that collects only on plastic, when wiped off with it leaves a stain.?

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What is black powder, that collects only on plastic, when wiped off with it leaves a stain.?

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  1. It could be one of a number of things; but if you live in an urban area, it is most likely soot from car exhaust; which may contain small amounts of organic materials or sulfur compounds that bind to the surface of plastic.  If you are in a cool area, where people burn heating oil, or even coal for heating purposes; the soot is even more noticeable.  Because of static electricity, the soot is attracted to plastic surfaces.

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