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Ivory statue is the carving of ivory, that is to say animal tooth or tusk, by using sharp cutting tools, either mechanically or manually. Humans have ornamentally carved ivory since prehistoric times, though until the 19th century opening-up of the interior of Africa, it was usually a rare and expensive material used for luxury products. Very fine detail can be achieved, and as the material, unlike precious metals, has no bullion value and usually cannot easily be recycled, the survival rate for ivory pieces is much higher than for those in other materials. Ivory carving has a special importance to the medieval art of Europe and Byzantium because of this, and in particular as so little monumental sculpture was produced or has survived.〔Williamson, 5-6〕 ==The material== Ivory is by no means just obtained from elephants; any animal tooth or tusk used as a material for carving may be termed "ivory", though the species is usually added, and a great number of different species with tusks or large teeth have been used. Teeth have three elements: the outer dental enamel, then the main body of dentine, and the inner root of osteo-dentine. For the purposes of carving the last two are in most animals both usable, but the harder enamel may be too hard to carve, and require removal by grinding first. This is the case with hippopotamus for example, whose tooth enamel (on the largest teeth) is about as hard as jade. Elephant ivory, as well as coming in the largest pieces, is relatively soft and even, and an ideal material for carving. The species of animal from which ivory comes can usually be determined by examination under ultra-violet light, where different types show different colours.〔Osborne, 487-488〕 Eurasian elephant ivory was usually obtained from the tusks of elephants in India, and in Roman times, from North Africa; from the 18th century sub-Saharan Africa became the main source. Ivory harvesting led to the extinction, or near-extinction of elephants in much of their former range. In early medieval Northern Europe, walrus ivory was traded south from as far away as Norse Greenland to Scandinavia, southern England and northern France and Germany. In Siberia and Arctic North America, mammoth tusks could be recovered from permafrost and used; this became a large business in the 19th century, with convicts used for much of the labour. The 25,000-year-old Venus of Brassempouy, arguably the earliest real likeness of a human face, was carved from mammoth ivory no doubt freshly killed. In northern Europe during the Early Middle Ages walrus ivory was more easily obtained from Viking traders, and later Norse settlements in Greenland than elephant ivory from the south; at this time walrus were probably found much further south than they are today.〔Williamson, 15〕 Sperm whale teeth are another source, and bone carving has been used in many cultures without access to ivory, and as a far cheaper alternative;〔Osborne, 488〕 in the Middle Ages whalebone was often used, either from the Basque whaling industry or natural strandings.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ivory carving」の詳細全文を読む スポンサード リンク
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