Gilders Paste is a wonderful little thing. I currently have a selection of four of their metallic colors. I would like to have all of their colors, but cannot find the rationalization for such a thing on my budget right now. Something to aim for! It is a type of color rub. You will see from my close ups that it is not really a full opaque coating but is more of an accent color. These comparisons were done on coral colored baked polymer clay.
This is "antique gold". It has more copper and less yellow in it than my antique gold jewelry findings.
This is "copper". You can see it is more the color of antique copper than shiny new copper.
This is silver. This had an odd texture. The other ones are like a hard cake of shoe polish. This is more souffle-like. It got everywhere on my desk with its fluffiness. I don't know if all the silvers are like that, or I got an odd container of gilders paste here. It is pretty though, with a color a bit darker than the silver plated toggle shown next to it.
I haven't found these in any bricks and mortar stores, but some internet stores will sell these. One great place to buy them is B'sue Boutiques. Her shipping is reasonable and very speedy. She also included a couple little candies in my order, their photo is not available due to reasons I don't care to mention. Ah, they were gone too soon! :-)