what is the black stuff in cigarette filters

what is the black stuff in cigarette filters pall mall shift have these marks on them, several of them have it not just one. this normal? never seen this before : r/Cigarettes Who Made That Cigarette Filter?

Name: what is the black stuff in cigarette filters pall mall shift have these marks on them, several of them have it not just one. this normal? never seen this before : r/Cigarettes Who Made That Cigarette Filter?
Brand: aquadia.hu
SKU: 3264745616
Price: 25.66 USD
Availability: InStock
Rating: 4.5454 (16 reviews)

SKU: 3264745616

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USD25.66 USD60.66

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Description

You can request that the seller take measures to eliminate the smell before closing, such as professional deep cleaning, repainting with odor-blocking primer, or even duct cleaning

Instead of burning tobacco, they use a battery-powered mechanism to heat a liquid (commonly known as e-liquid or vape juice) and turn it into inhalable vapor