Guess What This Sconce Is Made From?

I scored this sconce yesterday for only $20, which is a steal considering it's nearly three feet tall and its curlicue arms are made of heavy cast iron. There's a very specific name used to describe the painted tinplate leaves on the sconce, which is often used to make a number of decorative domestic objects. I'll give you a hint: Stray Dog Designs uses the material in most of its designs. Can you name it?