This autumn, I wanted to see how painting directly on a 10" x 8" copper panel compares to painting on linen glued to an aluminum panel -- my normal support for oil painting. Copper has a long history and solid reputation among traditional painters. I want to see if it will make bright objects like brass and lemon glow. So begins the Copper Challenge. In this post, I describe my setup and approach to both my "control" panel on linen and my copper panel.