black dots on cigarette filter in WTF is this black stuff in my cigarette filters? : r/Whatisthis and 18k gold offer bold pall mall shift filters have

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 The use of charcoal in modified cigarette filters for mainstream smoke carbonyl reduction PMC New insights in tobacco radiotoxicity: on the research of 210Po in modern heated tobacco productradioactivity, distribution, and dose assessment Environmental Science and Pollution Research Springer Nature Link Why does the filter have small holes around it like in the picture? : r Cigarettes Black Specks or Carbon Dust in Water: Where Does it Come From? Cigarette Filter Texture: Over 651 Royalty Free Licensable Stock Illustrations & Drawings Shutterstock

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