Here's a bit dated but very interesting YouTube on creating a photo print by using "dirt". The title caught my attention and I found the video pretty fascinating with a good example of the product creation and some real art skills. The video basically covers a gum print process but a full color one using unique pigments, the process being reminiscent of the dye-transfer process used way back. Sound's like this is the type of process to use if you want to make color photo prints to leave for your grand kids and their grand kids, and their grand kids, and................................