While I was reading the 'History of Color' I came across the pinatype process. ( here is the link to the pdf book http://www.archive.org/download/historyofcolorph00frierich/historyofcolorph00frierich.pdf ) It is a three color transfer process that uses dyes imbibed on an exposed dichromated gelatine plate ( DCG plate ). Each color is transferred to a final support in a fashion that sounds similar to carbon transfer, except the gelatine matrix ( for lack of a better word ) stays on the plate and only the dye is transferred. So you can repeat the process and make multiple prints from a single set of plates. Anyone know what sort of dyes might work for this? The original dyes seemed to be proprietary. Or should I be researching other dye transfer methods for clues? This would be a neat addition to my tri-color gums.