GB/T 3674-1993 provides specifications for phthalocyanine blue B. It specifies the technical requirements of phthalocyanine blue B, covering indicators such as Appearance, color light, tinting strength, light fastness, heat resistance, etc. Detailed description of its sampling and inspection rules to ensure product mass conformity. Specifies the corresponding test methods, such as the determination process of color light and tinting strength. The standard provides unified guidelines for the production, inspection and use of phthalocyanine blue B, which helps to ensure product mass, meet the needs of many industries such as coatings, inks, plastics, etc. for the pigment in terms of color presentation and performance stability, and promote the development of related industry norms.