Shagreen

Chagrin ( from the Turkish Sagri for croup ) refers to a type of leather from the back skin of horses, camels, donkeys, mules and other animals.

Shagreen leather is a by grains that are pressed into the still moist leather and later shaken out again, grained, stamped on the surface with fine, closely placed peaks and valleys material which has a strong thickness. It can be white or colored differently.

One used Chagrin for the horse stuff for scabbards, sheaths and book covers. The procedure for this particular type of leather has long been only in the Orient, in Astrakhan, Konstantin Opel and Bulgaria known until it was realized imitate it by means of heated rollers and plates. Here, the leather was in a sense granulated and engraved.

As an inexpensive substitute for the expensive leather was used for book covers also Chagrinpapier, a similar in appearance and virgin paper.

Under real Chagrin refers to the finely granulated skin of sharks, which was used for the purchase of cans, boxes, books, etc..

In polarization microscopy is denoted by Chagrin an apparent relief on the surface of a mineral grain in a rock thin section. By determining the Chagrinstärke can conclude on the relative refractive index of the studied mineral. Is the refractive index of the mineral is higher than the surrounding medium, usually a resin, the Chagrin is stronger. Is he on the other hand is smaller, and the Chagrin is less.