What are the characteristics of ice cracks?

Ice lines In the cold winter, the glass windows are covered with ice lines from morning till night. Now, you can only see it in the morning and at night. At about seven o'clock every morning, when the sun shines on the earth, the ice line begins to melt. At nine o'clock in the morning, Jinghe went out and stayed at home. No one. Ice lines are melting, and water drops slide off the glass surface like tears. The son looked thoughtfully and thought of Jiu Xiang. Tell him the operation is useless.

"Ice crack", also known as cracked porcelain, is a variety of ancient Longquan celadon. It is named because its stripes are as broken as ice and its lobes are layered on top of each other, which has a three-dimensional effect. Among all kinds of glaze cracks in Ge kiln, "ice crack" ranks first, and it is known as "the character of Ge kiln, with ice crack as the top". Because of its unique cracking in the firing process, it shows infinite natural beauty. Unfortunately, after the Song Dynasty, the process of firing "ice cracks" was lost.