Acid Blue 45 is an anthraquinone-based acid dye that gives a distinct, clear sky-blue shade. It is known for its good levelling properties, which ensure a uniform and consistent colour application, particularly on wool and silk. Its clean, bright hue and good lightfastness make it a popular choice for fashion textiles and yarns. Additionally, it finds use in colouring paper and soaps where a specific, stable blue is desired.
