Solvent Blue 128 is a phthalocyanine-based solvent dye that produces a strong, clean blue shade. It offers a good balance of color strength, stability, and economic value, making it a versatile choice for coloring a range of plastic resins. Its good fastness properties and reliable performance make it a suitable colorant for masterbatches and for the mass coloration of various polymers where a durable and consistent blue is needed.