Headstone Photos -- How is this Done?

[Lars Hagglund]

The pigment must resist heat of course

[Pete Andrews]

Sorry about coming to this late, but my curiosity was piqued, and I vaguely remembered something about it. Anyway, I finally tracked down some snippets of info in an old Dictionary of Photography, under the heading 'ceramics and porcelain'.There are 4 basic methods of doing this, but all of them start with a specially manufactured enamel plaque. The enamel is a soft vitreous ceramic on a copper base.The 4 methods given are:1 ) Sustitution process, where a platinum, palladium, gold or other metallic print is made on the enamel.2 ) Powder process, as mentioned above.3 )Carbro or carbon printing on the enamel.4 ) Transfer of a processed colloidal or albumen emulsion onto the enamel surface.After any of these processes, the image is coated with a low-temperature transparent glaze, and the plaqued is then fired. I've been unable to accurately date the book that this was taken from. My guess is 1920 to 1930.Anyone know a helpful potter?