dotted line on cigarette filters What is this for the filter? : r/Cigarettes black dots in cigarette filter

black dots in cigarette filter What is this dotted line for on the filter? : r Cigarettes 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 Golden Harvest Pipe Tobacco Full Flavor Premium Brands BNB Tobacco BnB Tobacco ESF DETR: a real time and high precision detection model for cigarette appearance Journal of Real Time Image Processing Springer Nature Link Good Stuff Gold Pipe Tobacco 6 oz. Bag Tobacco Stock Long term cigarette butts' decomposition over 10 years reveals multi stage microbial, chemical, and toxicological transformations ScienceDirect

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