helianthin definition

  • noun:
    • methyl orange
    • An artificial, orange dyestuff, analogous to tropaolin, and want it utilized as an indication in alkalimetry; -- labeled as also methyl orange.
    • A coal-tar color found in dyeing. It is the ammonia salt of dimethyl-aniline-azobenzene-sulphonic acid. It produces a fiery lime on silk and wool. Also known as gold tangerine.

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