How to distinguish the ice crack of Longquan celadon?

In the firing process of celadon, the glaze will shrink greatly. Our ancestors skillfully used the characteristics of different shrinkage coefficients of glazes to invent the crack glaze. Ge Kiln, one of the five famous kilns in Song Dynasty, is famous for firing granular glaze. According to the difference between big pieces and small pieces, Geyao products are named as ice crack, crab claw pattern, cow hair pattern, running water pattern, garbage leftovers and caviar pattern. Ice cracks are particularly difficult to make and are regarded as treasures in porcelain.

The opening of the ice crack is horizontally layered, and the crystal clear jade glaze, such as the ice flower extruded from the glass plate, is layered on the blank, and the glaze has no crack line and is as rich as a mirror.

The ice crack of ancient celadon is a royal porcelain specially fired for the court after the Southern Song Dynasty moved its capital to Lin 'an (now Hangzhou). The production process is extremely complicated, requiring nearly 100 processes. This process has been lost 1000 years.

To make ice crack glaze, it is necessary to accurately control the shrinkage ratio of raw materials of blank glaze, not too much or too little. The thickness of glaze is also very important. The glaze is thin, streakless and thick. When fired, the green body either cracks, deforms or the glaze falls off seriously. Sintering is a difficult point. The carbon monoxide in the kiln is weak, and the glaze is not colored, but it is thick, and the glaze will change color due to smoking. The curve control of sintering temperature directly affects the effect, so the yield of ice cracks is extremely low and there are few handed down works.

In order to restore the ice crack art of Longquan celadon, which has been lost for thousands of years, celadon artists have successfully fired ice cracks with strong three-dimensional sense after countless experiments and explorations, and obtained national invention patents. CCTV made a special interview.

Ice-cracked works are elegant, harmonious and varied, lined with beautiful shapes, and beautiful.

It is really a beautiful enjoyment to experience the process of celadon ice crack works coming out of the kiln. When the kiln temperature dropped to about 100℃, the kiln door slowly opened, and only the crackling sound in the kiln was heard, and a piece of porcelain was taken out. There were no cracks, and soon, with the crisp cracking sound, amazing phenomena appeared, just like the development effect of developing photos in a darkroom.