Thank you @ 5150sick and @ Condensation for drawing our attention and pointing out the problem to us.We really appreciate it, and we do apologize for lacking of knowledge on this, this item is removed from our shelves after we have read more information from google.This dark cotton, however, was used by many Chinese vapers and they suggested to us. It was our mistake that we didn't have enough searching before listing this item but we will also forward the information for those who were or are using this cotton.Thanks for VU and members here, i guess it is the reason that vapers need to connect in community. We are grateful that we are not in trouble because of your posts! And in future, we would still feel appreciated if you could point out our mistake.