Hey I recently bought my first Ti nail from a local dispensary in seattle, was told by them that this was medical grade 2 ect ect that they got it from a local supplier and the fact that i was paying a good 60 for it reassured me at the time that it wasn't a cheap metal or something. Now after doing some research online i feel a bit sketched out due to the apparently excessive amount of fake nails going around the internet. (also found out medical grade is a misnomer, was told that grades 1-4 are commercially pure titanium) Iv been using the nail for about a month, usual discoloration of blues purples and yellows iv been told about, no degredation of the ti itself, but occasionally it smells of a strange metallic scent (using propane to heat the nail) after heating and has a odd black layer on top of the nail that is always present after a dab despite how many times i clean it. My friend thought it might just be the leftover residue from the erl but it was my impression that vaping oil left little to no combustion after-material. These doubts coupled with the fact i found a chinese distributed ti nail online with design similar to my own led to me posting this and hoping someone from fc could shed some light on my situation because i honestly don't have enough experience to differentiate myself. iv attached pics of the nail from before I cleaned it, at the peak of its filth.