<P> Animal glue has existed since ancient times, although its usage was not widespread . Glue deriving from horse tooth can be dated back nearly 6000 years, but no written records from these times can prove that they were fully or extensively utilized . </P> <P> The first known written procedures of making animal glue were written about 2000 BC . Between 1500--1000 BC, it was used for wood furnishings and mural paintings, found even on the caskets of Egyptian Pharaohs . Evidence is in the form of stone carvings depicting glue preparation and use, primarily utilized for the pharaoh's tomb's furniture . Egyptian records tell that animal glue would be made by melting it over a fire and then applied with a brush . </P> <P> Greeks and Romans later used animal and fish glue to develop veneering and marquetry, the bonding of thin sections or layers of wood . Animal glue, known as taurokolla in Greek and gluten taurinum in Latin, were made from the skins of bulls in antiquity . Broken pottery might also be repaired with the use of animal glues, filling the cracks to hide imperfections . </P> <P> About 906--618 BC, China utilized fish, ox, and stag horns to produce adhesives and binders for pigments . Animal glues were employed as binders in paint media during the Tang Dynasty . Records indicate that one of the essential components of lampblack ink was proteinaceous glue . Ox glue and stag - horn glues bound particles of pigments together, acting as a preservative by forming a film over the surface as the ink dried . The Chinese, such as Kao Gong Ji, also researched glue for medicinal purposes . </P>

Why do they say send a horse to the glue factory