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Static charges?


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I remember an explanation about it from a materials scientist many years ago. As I recall, the visible patterns reflect stresses in the plastic, but I'm less sure about why the dust sticks to some area more than others. Static charge seems like a reasonable explanation. The areas under stress might have a slightly different charge than the areas around them. 

I know I can just wipe it off with a finger and see absolutely no other evidence of a pattern in the plastic. 

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