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哥窑、汝窑、官窑、钧窑和定窑是中国宋代的五大名窑,而其中的哥窑更是以其“金丝铁线”独领。所谓“金丝铁线”,主要是指器身上分布着众多纹片,俗称“文武片”、“百圾碎”,其中纹片大小结合,纹线呈深黑色,小片纹线呈褐。明代《格古要论》中有这样的描述:“哥窑纹取冰裂、鳝血为上,梅花片墨纹次之。细碎纹,纹之下也。”其特征可归纳为:黑胎厚釉,紫口铁足,釉面开大小纹片。哥窑产品还有一个重要特征,即所谓“攒珠聚球”。陶瓷界先辈孙瀛洲在其《元明清瓷器的鉴定》一文中表示,官、哥釉气泡密集似“攒珠”,是指哥窑釉内气泡细密像颗颗小水珠一样,满布在器表上。