A poor man's version that I have tried invloves printing positives on tranperancy film and spray painting the back with gold or silver metalic spray paint. Need to experiment to get the exposure of the print right. Still working on this but they are intriguing images. They also scan very poorly so I won't attempt to show them yet. If you really want to experiment: try printing a positive on vellum and spray painting the back. You will see what I mean about correct [for this process] exposure of the print being important.