Galuchat

Shagreen is a type of rawhide consisting of rough untanned skin, historically from a horse's or onager's back, or from shark or ray. In modern times, shagreen is produced from the skins of commercially-farmed Asian sting rays.

The word derives from the French chagrin and is related to Italian zigrino and Venetian sagrin, derived from the Turkic sağrı / çağrı 'rump of a horse' or the prepared skin of this part. The roughness of its texture led to the French meaning of anxiety, vexation, embarrassment, or annoyance.

Shagreen has an unusually rough and granular surface, and is sometimes used as a fancy leather for book bindings, pocketbooks and small cases, as well as its more utilitarian uses in the hilts and scabbards of swords and daggers, where slipperiness is a disadvantage.

In Asia, the Japanese Tachi, Katana, and Wakizashi swords had their hilts almost always covered in undyed rawhide shagreen, while in China, shagreen, whose use dates back to the 2nd century CE, was traditionally used on Qing dynasty composite bows. Typically the ears and the spaces above and beneath the grip were covered by polished shagreen (in which the calcified papillae are reduced to equal height and form a uniform surface), sometimes with inlay work of different coloured shagreen. Shagreen was a very common cover for 19th-century reading glasses containers as well as other utensil boxes from China.

The early horse-skin variety of shagreen was traditionally prepared by embedding plant seeds (often Chenopodium) in the untreated skin while soft, covering the skin with a cloth, and trampling them into the skin. When the skin was dry, the seeds were shaken off, leaving the surface of the leather covered with small indentations. Sources are not clear whether this was being done to imitate pearl ray-skin shagreen from East Asia or the technique was developed separately.

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Wikipedia