black dots in cigarette filter I opened up a from curiosity (I dont smoke) I cut the part from the tobacco part and saw the upper bit of the filter had parts and the What is that punch hole

What is that punch hole marks on the filter? : r Cigarettes I took my N30 apart to see what these black dots were. What are they? Mold??? Dust? The new mask filter is completely white. They don't supply new filters for this mask. mages of four cigarette filters showing the state of filter blockage. Download Scientific Diagram View of filter stains from cigarettes that had been smoked with filter Download Scientific Diagram

SKU: 35030114522 · From telecamera-cantiere.com