Century Dictionary and Cyclopedia
- n. A blue flocculent precipitate obtained when propiolic acid in sulphuric-acid solution is treated with reducing agents such as metallic iron, zinc, or copper. It differs from indigo in not easily yielding a sulphonic acid on heating.
- n. organic chemistry A substance resembling indigo blue, obtained artificially from certain isatogen compounds.
GNU Webster's 1913
- n. (Chem.) A substance resembling indigo blue, obtained artificially from certain isatogen compounds.
- -in (Wiktionary)
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