black dots on cigarette filter Custom Made Diamond 69874 ensuring exclusive 1966 patent for cigarette filter

1966 patent for cigarette filter with charcoal and cheese I opened up a cigarette from curiosity (I dont smoke) I cut the filter part from the tobacco part and saw the upper bit of the filter had black parts and the pall mall shift filters have these black marks on them, several of them have it not just one. is this normal? never seen this before : r Cigarettes PDF] Glass fiber contamination of cigarette filters: an additional health risk to the smoker? Semantic Scholar

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