CAS 2538-85-4 appears in our catalog under these names: Calcon, Na 3–OH–4–(2–OH–1–naphthylazo)–1–naphthalenesulphonate, Erichrome Blue Black R (C.I. 15705), Calcon®, pure, Mordant black 17 70+%. Offered by: TargetMol, GLPBio, Chemat, Thermo Scientific (Acros), Ambeed. Available pack sizes: 1g, 5g, 500mg, 500g, 100g, 25g, 1000g, 1kg.