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Chemical structures of the different dyes assayed. (A) Reactive Black 5 (diazo type); (B) Azure B (heterocyclic); (C) Reactive Blue 19 (anthraquinoid); (D) Aniline Blue (triarylmethane type); (E) Acid Blue 74 (indigoid); (F) Reactive Blue 38 (phthalocyanine type).
