| http://www.w3.org/ns/prov#value | - Suitable hydrophilic colloids include both naturally occurring substances such as proteins, protein derivatives, cellulose derivatives, e.g. cellulose esters, gelatin, e.g. alkali-treated gelatin (cattle bone or hide gelatin) or acid-treated gelatin (pigskin gelatin), gelatin derivatives, e.g. acetylated gelatin, phthalated gelatin and the like, polysaccharides such as dextran, gum arabic, zein, c
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