black spots in cigarette filter pall mall shift filters have these marks on them, several of them have it not just one. is this normal? never seen this before : r/Cigarettes black dots in cigarette filter

black dots in cigarette filter What is this dotted line for on the filter? : r Cigarettes TIL that cigarette filters change color not because they are trapping part of the cigarette smoke, but because they are designed to change color to lead consumers to think that they are What causes black spots on Master Spas filters? Brother sent me this photo, What type of mushies would be growing on the filters of cigs? : r mycology

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