Phthalocyanine Blue B(PB15:0)is a reddish-blue powder at room temperature and is insoluble in water. As an α-crystalline form of copper phthalocyanine pigment that has not undergone crystal form stabilization, its core chemical property is instability: at high temperatures or in certain organic solvents (such as aromatic hydrocarbons), its α-crystalline form is prone to transformation into the more stable β-crystalline form (e.g., Pigment Blue 15:3), resulting in darker shade and reduced tinting strength. Based on this characteristic, its primary applications are as an intermediate raw material for producing other stabilized phthalocyanine pigments (such as Pigment Blue 15:1 and 15:3), or for use in low-end printing inks, coatings, and stationery products where solvent resistance is not a critical requirement.