http://www.finishing.com/265/85.shtml I came across this question after spelunking the interwebs, and indeed this sounds like a fascinating proposition. Basically, print a gum negative on a sheet of metal and then electroplate it. The electroplated portions will then constitute the positive image. The result is a seriously stable photograph. Is this possible, plausible? I'm just thinking about the possibilities.... electroplating various metals in layers. Selective tarnshing, polishing, petina, etc.; could result in very beautiful and unique colors/tones. Please, I'd love to hear your opinions. Heck, it sounds fairly easy to do.