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Jin Si Tie Xian, also known as "Shan Xue", is a distinctive feature of the Ge Yao pottery. Due to the different expansion coefficients of the porcelain body and glaze, when cooled after baking, the glaze contracts more, resulting in a natural cracking phenomenon on the porcelain surface. The patterns are interwoven like a net or like ice breaking. Later, artificial penetration of ink into the cracks as a pigment, after coloring, the color is very deep, forming the "Jin Si Tie Xian".