You can do dichromate sun printing with casein. http://stores.photoformulary.com/casein-printing-kit/ …
Casein is a classic underpainting for oil paintings.
With the underpainting done in casein you can then do transparent oil glazes to render the painting. Similar to my egg here.pic.twitter.com/cYYb94vG05
8:39 AM - 28 Jul 2017
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