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Animal glue in granules. Animal glue is an adhesive that is created by prolonged boiling of animal connective tissue in a process called rendering. [1] In addition to being used as an adhesive, it is used for coating and sizing, in decorative composition ornaments, and as a clarifying agent.
Just as the angle of the sides of a cabochon creates the pressure to hold the stone in place, so there is an overlying principle in setting faceted stones. If one looks at a side view of a round diamond, for example, one will see that there is an outer edge, called the girdle, and the top angles up from there, and the bottom angles down from there.
When first introduced in 1947 as Cascorez Glue, Elmer's glue contained casein from dairy milk. [5] However over the second half of the 20th century, synthetic glue has become less expensive, more consistent from bottle to bottle, and lasts longer. [17] Elmer's does not currently use animals, animal parts, or milk to make glue. [18]
A cabochon (/ ˈ k æ b u ʃ ɒ n /; from Middle French caboche 'head') is a gemstone that has been shaped and polished, as opposed to faceted. The resulting form is usually a convex (rounded) obverse with a flat reverse. [1] Cabochon was the default method of preparing gemstones before gemstone cutting developed. [2]
Coral jewellery has been found in ancient Egyptian and prehistoric European burials, [3] and continues to be made to the present day. It was especially popular during the Victorian age. [5] Precious coral has hardness 3.5 on the Mohs scale. [6] Due to its softness and opacity, coral is usually cut en cabochon, or used to make beads. [7]
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