I bought some silver metal Zippo style lighters and tried to use them and was thoroughly dissatisfied with the way they turned out.
On the left, a simple 2" Unisub hardboard tile with a white surface - on the right, a silver metal lighter with no white surface. The picture was taken with a cell phone camera in a low light situation, and the original artwork for the tile was also low resolution, so it looks extra-extra grainy in this pic, but you get an idea of how colors turn out on silver metal.