Alizarin pure blue

Among anthraquiaoae dyes (see Dyes, anthraquinone). Acid Blue 78 [6424-75-5] C2 H25BrN20 S -Na, or Alizarin Pure Blue B, is a wool dye. Bromamine acid [116-81-4] (l-amiao-4-bromoanthraquiaoae-2-sulfonic acid), C24HgBrNO S, is a useful dye iatermediate. A number of bromo anthraquiaoae, pyrathroae, and benzanthrone dyes are known. 

Aliphatic solvents, alkyllithium compounds and, 14 250-251 Aliphatic sulfonates, 26 145 Aliquot samples, 13 413-415 analysis of, 13 416 Aliskren, 5 158 Alitame, 12 42 24 232 Alite, phase in Portland cement clinker, 5 471, 472t, 473t Alitretinoin, 25 790 Alizarin, color of, 7 331 Alizarin derivatives, 9 337 Alizarin pure Blue B, 4 361t Alkadienes, metathesis of, 26 923 Alkali/alkaline-earth cation recognition,... 

Alizarin pure blue B from the dye base (oleum). 233... 

Aminoanthraquinone is used not only in the preparation of 1,4-diatninoan-thraquinone it is the starting material for a series of important anthraquinone dyes of which alizarin pure blue B is an example. The preparation of this dye is briefly as follows ... 

Alizarin pure blue dyes a pure blue quite similar to the color of aniline blue (triphenylrosaniline). Its color strength is high and its fight fastness is very good. It is especially valuable for tin phosphate weighted silk with which it is widely used. 

Qualitative Reactions.—Alizarin is insoluble in water, but soluble in boiling alcohol or in ether it dissolves in sodium hydroxide solution, giving a solution which is violet-blue for pure alizarin, violet for anthra-purpurin, purple-red for flavopuipurin, and red for purpurin. The sul-phonic derivatives are soluble in water and give violet alkaline solutions. 

Blue and yellow shades of alizarin are known the former consists of pretty pure alizarin, while the latter contain both the trioxyanthraquinones isopurpurin and flavopurpurin. Alizarin may be fixed directly on w ool, the shade produced being weak, and of the yellowish-red tone characteristic of free alizarin solutions. This shade has no value in dyeing, and the application of alizarin is solely in form of its brightly coloured aluminium, chromium, and iron lakes. 

Methyl red Methyl red sodium salt Chlorophenol red Hematoxylin Litmus extra pure Bromophenol red Bromocresol purple 4-Nitrophenol Bromoxylenol blue Alizarin 4.4 t- V ... 

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