Alizarin



a solid appearing reddish-orange as crystals and brownish-yellow as powder, C 14 H 8 O 4 , one of the earliest known dyes, formerly obtained in its natural state from madder and now derived from anthraquinone: used chiefly in the synthesis of other dyes.
Historical Examples

From the alizarin-potassium thus obtained the alizarin is set free by the aid of hydrochloric acid.
Cooley’s Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades…, Sixth Edition, Volume I Arnold Cooley

Wash the alizarin thus separated, dry it81 by simple exposure to air, and purify it by repeated crystallisation out of alcohol.
Cooley’s Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades…, Sixth Edition, Volume I Arnold Cooley

Industrially, it ranks next to indigo and alizarin in importance as a natural dye stuff.
The Chemistry of Plant Life Roscoe Wilfred Thatcher

This is filtered off from the alizarin lake, heated to boiling, and acidified with hydrochloric acid.
Cooley’s Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades…, Sixth Edition, Volume I Arnold Cooley

On wool, the colour is so extremely fast to light and to milling that it may well serve as a substitute for alizarin.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 Various

In addition to alizarin, other anthracene derivatives are of industrial importance.
Coal Raphael Meldola

alizarin only stains the untreated woollen, whilst the piece treated with alumina is dyed red, and that with iron, purple.
The Chemistry of Hat Manufacturing Watson Smith

This is alizarin, the coloring matter contained in the madder root.
Creative Chemistry Edwin E. Slosson

Magenta was also a substantive colour, but alizarin was certainly not one of this class.
The Chemistry of Hat Manufacturing Watson Smith

In the roots three coloring matters are obtained: alizarin and purpurin, which are both red, and xanthin, which is yellow.
Rugs: Oriental and Occidental, Antique & Modern Rosa Belle Holt

noun
a brownish-yellow powder or orange-red crystalline solid used as a dye and in the manufacture of other dyes. Formula: C6H4(CO)2C6H2(OH)2

alizarin a·liz·a·rin (ə-lĭz’ər-ĭn)
n.
An orange-red crystalline compound used in making dyes and as an indicator.

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