from The Century Dictionary.
- noun A coal-tar color used in dyeing, very similar to alizarin, but having a yellower shade.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry 1,2,6-trihydroxyanthraquinone
Sorry, no etymologies found.
Anthrapurpurin and flavopurpurin differ little from each other, though the shades dyed with the latter are more yellow.
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.
"Alizarins for reds" all contain more or less of alizarin properly so-called, from 1 to 10 per cent., along with anthrapurpurin and flavopurpurin.
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.