A type of glazed pottery with the dominant colors of yellow, brown and green was very popular in the Tang Dynasty (618-907). It was later called the tri-colored glazed pottery of the Tang Dynasty, or Tangsancai.
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The Tang tri-colored glazed pottery is a low-melting glaze pottery. It was made by adding metallic oxides into the colored gaze and calcining the object, thus forming different colors including the predominant yellow, brown and green. The chemicals in the glaze changed gradually in the firing process, creating a variegated effect that has a majestic and elegant artistic attraction. Tri-colored glazed pottery was usually used for burial objects. The loose and brittle quality of its base and its low waterproofing properties meant it was not as practical as the blue and white porcelain that had already emerged by that time.
（Source: chinaculture.org）