Alizarin blue

The first quinoline derivative obtained by the process (a) was the dye alizarin blue (Prud homme, 1877). f -Nitroaliza,rin was heated with glycerol and sulphuric acid. The constitution of the product was established by Graehe ... 

Sometimes the amine can be dispensed with, and the corresponding nitro-body used alone. It is reduced by the hydrogen arising in the reaction. Of technical interest is the fact that /J-nitro-alizarin on heating with glycerol and sulphuric acid yields a blue dye—Alizarin Blue. (B., 16, 445 29, 708 A., 201, 333.)... 

Of the blue lakes, mention may be made of those of indigo and logwood, alizarin blue, basic triphenylmethane blues and methylene blue. Violet lakes are made with methyl violet and the like or with mixtures of blues and reds. 

Alizarine red (S marks), Erweco alizarine acid red, alizarine orange S W, alizarine cyanine, brilliant alizarine cyanine, anthracene blue (S Marks), acid alizarine blue, alizarine dark green W, alizarine blue (S Marks), alizarine green A alizarine black S, alizarine indigo blue (S Marksl, coeruleine (S Marks). 0 n the addition of a few drops of dilute caustic soda (1 20), the colour becomes more 1 intense, and bluer ... 

Alizarine blue (Anthraquinone Class). 1 i c Colour changed to brown, becoming blue again on exposure to air Alizarine Class. Mordant present. ... 

Naphthazanne, alizarine blue black S W, W, brilUant/.alizarine black, alizarine black S,WR,WX, 3 etc. g <5 s e 8. ... 

Alizarine blue, alizarine cyanines or anthracene blues or Cr mordant. f p 1 SI at... 

Alizarine cyanine black, alizarine blue black B. 

Copper-containing proteins Alizarin Blue S Specifically indicates the presence of copper... 

In 1877 Prud homme discovered alizarin blue its industrial production was effected by Brunck in the following year. 

It comes into commerce in paste as Alizarin Orange, and is used in dyeing and printing, though its principal application is in the manufacture of Alizarin Blue. 

This dyestuff is prepared by heating -nitroalizarin with glycerine and sulphuric acid. It is peculiar in so far that it possesses the lake-forming properties characteristic of the alizarin dyes, and is at the same time a weak base. Alizarin blue was discovered by Prud homme [28], and the determination of its constitution by Graebe [29] led to the synthesis of quinoline by Skraup from glycerine, nitrobenzene, and aniline. 

Alizarin blue has the composition Ci7H9NO, and stands in the same relation to alizarin as quinoline to benzene. 

With chromium oxide, alizarin blue gives a stable indigo-blue lake. 

It is chiefly applied in the form of its bisulphite compound, the latter being the principal constituent of the commercial Alizarin Blue S [31]. This is a reddish-brown compound and is decomposed on heating, alizarin blue separating. The bisulphite compound is printed with acetate of chromium and, on steaming, the chromium lake of alizarin blue is fixed on the fibre. The bisulphite compound may be precipitated from its solutions by common salt, and comes into commerce as an easily soluble brown powder. 

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. 

If the mixture be heated to 120°, or if alizarin blue-green is heated with concentrated sulphuric acid to 120°, an intramolecular change takes place, a new mono-oxyalizarin blue monosulphonic acid being formed. This body is an article of commerce, and is Icnown as Alizarin Green S. 

If, finally, the temperature of the reaction between sulphuric acid and alizarin blue be raised to 200° to 210°, or if alizarin green is heated to the same temperature with concentrated sulphuric acid, a third dyestuff. Alizarin Indigo-blue, is obtained. This body is a trioxyalizarin-blue. The commercial products are pastes which contain the bisulphite compounds. The shades produced in dyeing are sufficiently indicated by the names, being a dull indigo-blue and a dull bluish green respectively. The best results are obtained with chromium mordants. 

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. 

Thymolsulphonc phthalein Phcnolphthalein Thymolphtbalein Alizarin yellow Tropaeolin O Alizarin blue S... 

Alizarine Blue. 5 Dihydroxynaphtho[2,2 /]quin-oiine-7,l2 dione 7.8-dihydroxy-5,6-phthaly[quinoline Alizarin Blue R C.I. 67410- C 7H9N04 mol wt 291-25. C 70,10%, H 3.12%, N 4.81%, O 21,97%. Prepn from 3-nitro-alizarin, glycerol, and coned sulfuric acid Auerbach, J. 

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