ADR531

my old bongs use to be made out of a 2liter soda bottle with a tinfoil bowl. after hearing about how it's so bad for u, i decided to get a metal screen. i got one from the little faucet piece and also from a cooking thing where u strain out the water. i smoked from it today and when i put a lighter up to it it leaves a brown spot. i don't think i could melt it but do u think it's safer for me? and will it relase some kind of oxide, bc i heard copper is the worst to smoke from? hlep me out here