So I picked up this wok from an estate sale. It has no markings, a matte finish, all black, medium sized, and seems the same texture & shade inside & out. Pan itself is about 1mm thick. It's not shiny smooth really - the surface shows wear and what looks like gristle spots across it but no tell-tale flakes. Magnets stick to it so it's not aluminium.
I attached some pics, one of 'em is a close up of the surface. I use high heat and don't wanna melt my lungs from fumes or anything so any ideas? Any easy way to rule teflon out?