ABSTRACT
The difference between gelatin and glue is in the extent of processing. A gelatin processed for photographic use would be exceptionally pure, of high molecular weight, and devoid of specific chemical impurities. An edible gelatin would be free of heavy metals, microorganisms, and any impurity that would make it unsuitable for human consumption. Inedible gelating or glue does not require as much refining and is suitable for industrial or adhesive applications, where less stringent requirements are found. Fish gelatin coatings are used in all these applications.
