Definitions
from The Century Dictionary.
- noun A mordant color, a trihydroxyanthraquinone, C6H3OH(CO)2C6H2(OH)2, isomeric with purpurin: sometimes called
isopurpurin .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry 1,2,7-trihydroxyanthraquinone
Etymologies
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Examples
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"Alizarins for reds" all contain more or less of alizarin properly so-called, from 1 to 10 per cent., along with anthrapurpurin and flavopurpurin.
Scientific American Supplement, No. 286, June 25, 1881 Various
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It is now known, thanks to the researches of Perkin, Schunck, Roemer, Graebe, and Liebermann, that in the manufacture of artificial alizarin there are produced three distinct coloring matters -- alizarin, iso or anthrapurpurin, and flavopurpurin, the two latter being isomers of purpurin.
Scientific American Supplement, No. 286, June 25, 1881 Various
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Anthrapurpurin and flavopurpurin are obtained from two isomeric disulphanthraquinonic acids, improperly named isoanthraflavic and anthraflavic acids, which are converted into anthrapurpurin and flavopurpurin by a more profound action of potassa.
Scientific American Supplement, No. 286, June 25, 1881 Various
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