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A benzidene direct dyestuff (scarlet) produced by coupling diphenyl-bis-diazonium chloride with naphthionic acid; first of a long series of derivatives. Used as a chemical indicator for acid solutions in the pH range 3-5, (blue-red).
rouge congo . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/rouge%20congo/1/fra (22.07.2026)
