Alizarin-bordeaux

The fact that dihydroxyanthraquinones can be directly oxidised to higher phenols with fuming sulphuric acid is of technical importance. Alizarin and quinizarin yield in this way the same 1 2 5 8-tetra-hydroxyanthraquinone (alizarin bordeaux), which can be further oxidised to the important compound anthracene blue (1 2 4 5 6 8-hexa-hydroxyanthraquinone). This dye is obtained technically from 1 5-or 1 8-dinitroanthraquinone by means of a very interesting reaction,... 

Alizarine Bordeaux, aitzarine claret, alizarine maroon. fMz Irf53 rl l ... 

This dyestuff produces fine Bordeaux shades on alumina mor-dantSj and in colour-printing a blackish blue is obtained with a chromium mordant. On wool a deep claret with a violet tone may be obtained. Alizarin Bordeaux crystallises from nitrobenzene in fine red needles which have a metallic lustre. It may be distilled, undergoing only slight decomposition. 

If alizarin Bordeaux be dissolved in concentrated sulphuric acid and treated with manganese peroxide or arsenic acid, oxidation takes place, a pentoxyanthraquinone being formed —... 

Alizarine blue may be oxidised by action of fuming sulphuric acid, the process being analogous to that used for the preparation of Alizarin, Bordeaux. At 50° to 60° a dyestuff called Alizarin Blue-green is formed, and is best isolated in form of its bisulphite compound. It is a monosulphonic acid of mono-oxyalizarin blue. 

This reaction has been applied to the technical preparation of important dyes such as Alizarin Green S, Alizarin Bordeaux, Alizarin Cyanine R, and Alizarin Cyanin Black. ... 

Acid chrome red, acid anthracene red, acid alizarine red, anthracene chrome red, acid alizarine garnet, azo alizarine Carmoisine, chrome fast Bordeaux, cbrome fast garnet, chromotropes, diamond red, eriochrome red, eriochrome Bor- deaux, omega chrome red, oxychrome garnet, palatine chrome red, eriochrome olive, palatine chrome violet, anthracene chrome violet, acid chrome blue, azi chrome blue, chrome fast blue, chromotrope blue, omega chrome blue. 

Anthracene chrome red, add alizarine red, eriochrome red, eriochrome bordeaux. eriochrome garnet oxychrome garnet, diamond red. palatine chrome red. omega 3 chrome red, etc. i P g.s s 5 r. O 13. 3 a-l Decolorised. Colour is not by air or by perulphatc A for a mordant (C Mordant present. Boll with 5 per cent, sodium aceiate and a small piece of white cotton for two or three minutes. 

From alizarin there can be prepared, further, by nitration, the a- or /J-nitro-alizarin, and from this, by reduction, the corresponding amido-alizarin. From (i-nitro- and amido-alizariu, by heating with glycerol and sulphuric acid, the important Alizarin Blue is obtained. Further, by the action of fuming sulphuric add on alizarin there is obtained a tetraoxyanthraquinone (Bordeaux), etc. 

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