Wakeman, Nellie A. (Nellie Antoinette) · Madison : University of Wisconsin · leaf 119
117 Pigments: CnH 2n— i6 II. A. 1.) Monohydroxy anthraquinone pigments. Of this group of dihydroanthracene derivatives only one representative, the monohydroxy -2- anthraquinone, is known. O … Monohydroxy -2- anthraquinone was first isolated from Olden - landia unibellata by Perkin and Hummel1 in 1893. It crystal- lizes in glistening yellow needles which melt at 302°. Solu- tions of the alkali hydrates dissolve it, forming a red liquid from which it separates, when very concentrated, in…
Pigments · Plants
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