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Tortoiseshell
Tortoiseshell or tortoise shell is a material produced from the shells of the larger species of tortoise and turtle, mainly the hawksbill sea turtle, which is an endangered species largely because of its exploitation for the material. The large size, fine colour and unusual form of the hawksbill's scutes make it especially suitable. The distinctive patterning is referred to in names such as the tortoiseshell cat, several breeds of guinea pig, and the common names of several species of the butterfly geni ''Nymphalis'' and ''Aglais'', and some other uses.
==Uses==
Tortoiseshell was widely used from ancient times in the West and in Asia, until the trade was finally banned in the 1970s. It was used, normally in thin slices or pieces, in the manufacture of a wide variety of items such as combs, small boxes and frames and inlays in furniture and other items, frames for spectacles, guitar picks and knitting needles. Despite being expensive, tortoiseshell was attractive to manufacturers and consumers because of its beautiful mottled appearance, its durability, and its organic warmth against the skin.〔(Tortoiseshell ban threatens Japanese tradition ), CNN website〕
The initial processing involved separating the layers of the scutes from the live animal's carapace by heating, softening the plates by boiling them in salt water and flattening them under a press. Two pieces could be fused by use of a hot iron, but like the earlier stages, great care had to be taken not to lose the colour. Finishing and polishing was done by various techniques mainly in Europe or in the US.〔Transactions, 344-346〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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