Acid red 1

Acid Red 1 (CAS 3734-67-6) is a synthetic azo dye also known as Red 2G, CI 18050, and Cerven 2G. It carries no E-code designation for food use in the EU and is classified under HS code 32129000 as a colorant for industrial applications.

In textile dyeing, Acid Red 1 bonds to protein and polyamide fibres through ionic interaction with amino groups, producing bright red shades with good wash fastness. It is also applied in leather finishing and paper dyeing, where its water solubility allows even penetration into fibrous substrates at controlled pH levels.

Acid Red 1 is supplied as a powder grade for direct dissolution in aqueous dye baths. It falls under REACH registration requirements for EU supply, and buyers should confirm compliance documentation prior to procurement. Standard packaging formats include fibre drums and multi-wall bags depending on order volume.