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nature : Yun-qing, or also known as the blue ocean. A translucent blue paint. More generally contain sodium sulfide and has a special structure of silicate. While alkali and light stability, resistance to climate. But in cases of acid change. For rubber, Qibu, paper, ceramics, cement bricks and color painting of a blue pigment, also used in the coatings industry to remove white paint yellow. By kaolin, soda ash, sulfur, or diatomite quartz powder by burning and prepared. A small blue stone into natural ore output.
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