Acid red 33

Acid Red 33 (CAS 3567-66-6), also known as CI 17200, Azo Fuchsine, and D&C Red No. 33, is a synthetic azo dye approved for food, cosmetic, and industrial coloring.

Where is Acid red 33 used?

• Personal care and cosmetics: coloring hair dyes, lipsticks, and rinse-off products with regulatory approval for skin contact
• Food-grade: confectionery, beverages, and maraschino cherries in markets with regulatory clearance
• Textile and leather: dyeing protein-based fibers such as wool and silk, where acid dye chemistry bonds under low-pH dyebath conditions
• Paper manufacturers apply it for decorative and specialty paper coloring.

Good to know: Surface uniformity and shade consistency are critical in these applications.

Commercial specifications

• Food-grade and cosmetic-grade purity typically meeting FD&C or D&C certification standards