Specification Product Name CALCON CARBOXYLIC ACID Synonyms 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo) naphthalene-2-carboxylic acid CAS NO. 3737-95-9 Molecular Formula C21H14N2O7S Formula Weight 438.41 Appearance Dark Red Powder Structure     Tests    Limits Solubility 0.1% (95%EtOH) - Clear Yellow Solution Absorptivity 1%/1cm, (pH 8.8) at λ max.573.0 nm >1000 (pH 6.5) at λ max.435.0 nm - >1000 - >490 Loss on Drying at 110°C (1hr) - <3%         REVISED: 1-1-2012