black spots in cigarette filter What causes on Master Spas filters? Today a black surprise for

Today a black surprise for Jen I cleaned my filter This is the e first time I have such black spot on the filter Do you have any idea ? black dots in cigarette filter WTF is this black stuff in my cigarette filters? : r Whatisthis View of filter stains from cigarettes that had been smoked with filter Download Scientific Diagram black dots in cigarette filter Why do these cigarettes have a perforation on the filter? : r black dots in cigarette filter What is this dotted line for on the filter? : r Cigarettes

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