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Hi there
According to Wikipedia, Casein was used for buttons et al in the past,
Thats after it has been treated with formaldehyde. Very nasty stuff. Not something you should do in the kitchen.
http://www.howstuffworks.com/environmental/green-tech/sustainable/5-plastic-substitutes4.htmWhat is described is a basic casein glue. All explained here:
http://www.fpl.fs.fed.us/documnts/fplrn/fplrn158.pdfThis is the best bit
It has been found that casein of the very highest grade is not essential for gluemaking. It does not follow, however, that a decidedly inferior casein will yield a high-grade glue; for instance, moth infection may alter the properties of casein to such an extent that water-resistant glues cannot be prepared from the infected material. A casein suitable for gluemaking should have a low fat and acid content, should be free from burnt or discolored particles, sour odor, larvae, maggots, and other extraneous animal matter; and it should be ground fine enough to pass through a 20-mesh sieve.
Try Smart Plastic, bottom of the page.
http://www.deluxematerials.co.uk/pages/latestproducts.htm