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Ivory
Ivory is a hard, white material, derived from the tusks and teeth of animals, that is used in art or manufacturing. It consists of dentine, a tissue that is similar to bone. It has been important since ancient times for making a range of items, from ivory carvings to false teeth, fans, dominoes and joint tubes. Elephant ivory has been the most important source, but ivory from many species including the hippopotamus, walrus, pig, mammoth, sperm whale, and narwhal has been used.
