Acid blue 80

Acid Blue 80 (CAS 4474-24-2), also known commercially as Alizarine Fast Blue R and Weak Acid Brilliant Blue RAW, is an anthraquinone-based acid dye delivering deep, bright blue shades.

Where is Acid blue 80 used?

• Textile processing: applied to protein fibers such as wool, silk, and nylon, producing level dyeings with good fastness to washing and perspiration for apparel and technical fabrics
• Leather finishing: acid dye baths for uniform surface coloration on finished hides
• Printing: specialty inks for stable, saturated blue tones
• Paper and coated substrates: used where visual output is necessary
• In food-contact or cosmetic-adjacent applications buyers must confirm regulatory status.

Good to know: Limited use in food-contact or cosmetic-adjacent applications requires buyers to confirm regulatory status.

Commercial specifications

• Standard commercial grades at defined dye content concentrations, commonly expressed as a percentage of active colorant