产品通用描述： Features: 1)Appearance:dark blue powder 2)Strength:130%Min(Compared with standard) 3)Ratio between sodium sulphide(50%) 4)Dip-dye temperature:80-85 degree C 5)Uses:the color begins to be light red when treated with bluestone and sodium bichromate.,capable of withstanding washing perspiration,rubbing and hot pressing
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