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alizarin |
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alizarin (əlĭz`ərĭn), or 1,2-dihydroxyanthraquinone, mordant vegetable dye obtained originally from the root of the madder plant (Rubia tinctorum), in which it occurs as a glucoside. The term also includes a group of synthetic dyestuffs prepared from coal-tar derivatives. A method for the synthesis of alizarin was first discovered (1868) by Karl Graebe and Karl Liebermann, German chemists. With salts of metals the compound forms brilliant lakes lake, in dyeing, an insoluble pigment formed by the reaction between an organic dye and a mordant . The color of a lake depends upon the mordant as well as the dye used. Generally, lakes are not as colorfast as many inorganic dyes, but their colors are more brilliant. ..... Click the link for more information. , although by itself it is a poor dye. Turkey red is produced with an aluminum mordant, other shades of red with calcium and tin salts, dark violet with iron mordants, and brownish red with chromium. Purpurin, also used in dyeing, occurs with alizarin in madder and is produced synthetically. |
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? Mentioned in | ? References in periodicals archive | |
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That night was a
drapery of colors, prussian blues, thalo green, manganese, peppered
with a rose madder that somehow deepened into a rich spray of
alizarin crimsons, cadmium reds and flashes of cobalt. Classical
organic pigments with lower fastness properties than the
high-performance types include 2B Red, pyrazolone reds and oranges,
diarylide yellow, Red Lake C, alizarin maroon and lithol rubine. |
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alizarin
