I am the inventor of the Texas Chrysotype process. View Camera published an article on the process in the March/April 2012 issue. Not only can you print out fine grained, continuous tone images with gold with no need for humidification (and a prayer), but with variations I have developed on the process you can print out gold-platinum, platinum-palladium, gold-platinum-palladium, gold-palladium, and pure palladium images. All with contrast control, no development, and no humidification. Incidentally, only a 10% platinum solution is necessary.
Photography. Reinventing the traditional printing processes with noble metals.