Copper Pot is the least duochrome of the three polishes, shifting from a copper colour (duh) to bronze/yellowy gold. The PR release calls it "a deep olive tan". I prefer the formula on this to what some of last autumn's Beetlejuice polishes had - it didn't pooling at my cuticles, but it did bubble a little (despite waiting a good five minutes between each coat. Boo). I used three coats for my photos, which gave it full opacity.
See what I mean? It looks glow-y rather than duochrome-y. I don't actually like it very much. I'm just not a huge fan of polishes with a yellow or orange tone to them. Meh.