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Norland Products Photoengraving Glue are used as photoengraving glue in a photo resist is based principally on the adaption of these properties; fish gelatin solutions can be made light sensitive, are easy to use as coatings, and upon drying these coatings can be insolubilize with light. Further baking will convert the coating into an acid resistant polymer. Although fish gelatin has been used in commercial processes since 1890, few people are aware that there exists any other type of gelatin but animal. Both are obtained from a similar source — the skin. With animal gelatin, the usual source is the hide of cattle, although gelatin may be obtained from the skin of any other animal where sufficient quantities are to be found. With fish gelatin, the usual source is from the cod. Chemically speaking, both types of gelatin have the same 20 basic chemical constituents. However, the proportions of these chemical constituents differ, depending upon the source, whether the source be fish or animal, or different species of fish or animal.