what is the black stuff in cigarette filters could be causing soot on new air filters? Can anyone tell me what

Can anyone tell me what this black stuff is on my filter please Filter as Fraud The Center for the Study of Tobacco and Society black dots on cigarette filter Wtf is this black stuff in my filter : r Cigarettes Marlboro Filter Black Clove Cigarette CiggiesWorld 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

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