These are great! Where do you get the sheet metal? And why do you have to oxidize it?
Sorry for all the questions...but I LOVE metal art!
I get my metals from Rio, depending where you live you may have a local supply shop, but I don't. I think the most frequently mentioned other shop I'm aware of online is monsterslayer.com, but I've never bought from them.
They're oxidized to blacken the letters, I use liver of sulfur, but you can put your metal in a plastic bag with an egg, as far as less toxic versions go, or using what may be on hand. http://www.riogrande.com/http://www.monsterslayer.com/
and Rio requires you open an account, but you don't need a tax ID or anything, just name,email addy etc