Much of the original development of adhesives based on natural products has come in the woodworking and paper industries. The first references in literature concerning glue providing simple procedures for making and using animal glue were written about the year 200 BCE. Many art objects and furnishings from the tombs of Egyptian pharaohs are bonded or laminated with some type of animal glue. A casket removed from the tomb of King Tut shows the use of glue in its construction. Paintings and murals from the period between 1500-1000 BCE show details of wood gluing operations. Origin and HistoryĪnimal glues have been in use since ancient times. A standard viscosity range is associated with each bloom level. Glue is also tested for its viscosity at this same 6 and 2/3% concentration. If this procedure requires 200 grams, then the glue is a 200-bloom value glue. A device called a Texture Analyzer or Bloom Gelomater is then used to measure the weight in grams required to depress a standard plunger 4 millimeters into the gel. Bloom value is a measurement of the strength of a gel formed by a 6 and 2/3% solution of the glue that has been kept in a constant temperature bath at 10 ✬ for 18 hours. Gelatin glue is graded and sold by its Bloom Value or Bloom strength.
BLOOMING GELATIN SHEETS PROFESSIONAL
Gelatin is preferred by many professional gilders over hide glue, because it can take a burnish easier than hide glue when mixed with gilder's clay, chalk or gesso. Sheet or plate gelatin is sometimes preferred over granular or powdered animal glue, because it results in a clearer, more transparent product. This is a technical grade of gelatin made in Italy of pork skin.
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