casein
An acid-coagulable protein, occurring as a
suspension of calcium caseinate in skim milk. It
is possible to isolate it as an alkali-solution
white powder by treating cow's milk with either
mineral acid or rennet. The acid casein is used in
the sizing of paper, as a simple adhesive, in the
manufacture of coated papers, and as a plastic in
leather finishes. Casein adhesives are little used
in bookbinding as they can only be made workable
by the addition of rather strong alkalies, which
makes them unsuitable for use with paper or
vellum. (52 , 198 , 309 )
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