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Animal-origin glues are adhesives made by boiling animal tissues for a long time, and from the chemical point of view they are gelatinous and albuminoid protein substances bearing different names. The most frequently used are gelatins. They are extracted from raw animal hide residues, from cartilages, tendons, and from the gelatinous matter extracted from bones, on which the name and quality of gelatin depends. The gelatin extracted from unhaired hide waste/pelt waste resulting from unhairing bovine hide from tann...