![Amazon.com: actiTube - Activated Charcoal Filters for Rolling 8,4mm - 1 Box = 100 Filters : Health & Household Amazon.com: actiTube - Activated Charcoal Filters for Rolling 8,4mm - 1 Box = 100 Filters : Health & Household](https://m.media-amazon.com/images/I/71FXlN6wT3L.jpg)
Amazon.com: actiTube - Activated Charcoal Filters for Rolling 8,4mm - 1 Box = 100 Filters : Health & Household
![Smoking a joint with an active charcoal filter and i noticed some kind of black oil on my fingers. What is this? : r/trees Smoking a joint with an active charcoal filter and i noticed some kind of black oil on my fingers. What is this? : r/trees](https://preview.redd.it/smoking-a-joint-with-an-active-charcoal-filter-and-i-v0-gfb0gyr9y4e81.jpg?width=640&crop=smart&auto=webp&s=0069e293539f0b361ee46138a5d05e81459f52dd)
Smoking a joint with an active charcoal filter and i noticed some kind of black oil on my fingers. What is this? : r/trees
![Amazon.com: actiTube - Activated Charcoal Filters for Rolling 8,4mm - 1 Box = 100 Filters : Health & Household Amazon.com: actiTube - Activated Charcoal Filters for Rolling 8,4mm - 1 Box = 100 Filters : Health & Household](https://m.media-amazon.com/images/I/71L0RwNS2UL.jpg)
Amazon.com: actiTube - Activated Charcoal Filters for Rolling 8,4mm - 1 Box = 100 Filters : Health & Household
![Berlin, Germany. 01st Aug, 2018. A young man prepares a joint from a marijuana-tobacco blend. In this joint, he uses an activated carbon filter instead of a normal filter. Credit: Gerald Matzka/dpa-Zentralbild/ZB/dpa/Alamy Berlin, Germany. 01st Aug, 2018. A young man prepares a joint from a marijuana-tobacco blend. In this joint, he uses an activated carbon filter instead of a normal filter. Credit: Gerald Matzka/dpa-Zentralbild/ZB/dpa/Alamy](https://c8.alamy.com/comp/PD36NB/berlin-germany-01st-aug-2018-a-young-man-prepares-a-joint-from-a-marijuana-tobacco-blend-in-this-joint-he-uses-an-activated-carbon-filter-instead-of-a-normal-filter-credit-gerald-matzkadpa-zentralbildzbdpaalamy-live-news-PD36NB.jpg)