Tao inkstone is jade green and fine-grained, and grinds ink quickly and finely.
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culture
One of the 四大名砚 (four famous inkstones), with 端砚, 歙砚 and 澄泥砚. The stone is quarried along the 洮河 in 卓尼 County, Gansu, and the deep shade called 鸭头绿 ("duck-head green") is the most prized.
