Acid red 44

Acid Red 44 (CAS 2766-77-0) is a synthetic azo dye also known by the names Ponceau 6R, CI 16250, and Acid Red 6A. It carries no assigned E-code for food use in the EU and is classified under the Pigments and Colorants category with the molecular formula C20H14N2O7S2.2Na.

In textile dyeing, Acid Red 44 bonds to protein and polyamide fibres under acidic conditions, producing deep red shades with reliable wash fastness. It is also applied in leather finishing to achieve uniform surface coloration, and in paper manufacturing where it imparts consistent red toning during pulp or surface treatment stages.

Acid Red 44 is supplied as a powder and is subject to REACH registration requirements for EU market compliance. Procurement teams should confirm grade specifications, dye content, and impurity profiles directly with the supplier, as these parameters vary by intended application and regional regulatory requirements.