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Proto-celadon was a type of Chinese ceramic which developed during the Shang and Jin periods. It is often described as "proto-porcelain", and was usually glazed in light yellowish green.
The body of proto-celadon was high-fired, the Chinese classification including porcelain, with an iron content below 3%. Firing temperature was around 1200 degrees Celsius. In Western terms the wares are stoneware. Surface treatment consisted of a lime glaze. The shapes manufactured in proto-celadon were similar to the objects manufactured in bronze.
Proto-celadon was mainly produced in the areas south of the Yangtze river. From the Han dynasty onward, production greatly improved in quantity and quality.