black stuff in cigarette filter Butting out: The life and times of a I opened up a cigarette

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 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 ? plumbing Why is there black residue in my whole house filter? Home Improvement Stack Exchange 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 Why Is My Air Filter Black? Causes for Furnace, AC, and HVAC Filters Turning Dark

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