What illegal drug leaves your finger black?

Answer 1

smoking crack bc of the "chore boy" copper that is used at the end of the glass pipe is usually pushed out and re-rolled to get the black stuff out of bad quality crack, usually excess baking soda bc the person was too lazy or incompetent to recook the crack to purify it. or the person uses the lighter on the glass pipe itself and the flame that touches that part of the glass leaves a black part. The person will often push the chore boy copper part to the other side and uses the pipe the other way around.

also, meth pipes too if the person is using a regular lighter and touches the bowl, which previously had the flame on it.