Song-dynasty celadon-glazed wares are very popular at auctions.
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culture
青釉 is the iron-bearing glaze that gives celadon (青瓷) its trademark green-grey hue, fired in reducing atmosphere. Famous variants: 粉青 'powder green' and 梅子青 'plum green' from the Longquan kilns 龙泉窑 (Zhejiang) at their Southern Song peak.