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).
Online Language Learning Tool SkELL allows users to search for phrases in sentences, collocates and similar words. These examples have been automatically selected and may contain errors.
