Aniline Blue WS

• Triphenylrosanilin
• Solvent Blue 43

Fixed

222 ° C.

Insoluble in water, soluble in alcohol

Template: Infobox chemical / molecular formula search available

Aniline blue is a dye from the group of triphenylmethane

Although there are various displayable of aniline blue dye, as is understood but under this name only a specific color, which is referred to as an ordinary aniline blue or Fuchsinblau ( Bleu de Lyon, Bleu de Paris ) and the hydrogen chloride compound of Triphenylrosanilins is ( Triphenylrosanilinchlorhydrat ). It is a water-insoluble, dark brown powder, which in spirit with gorgeous blue color but dissolves ( spirit soluble aniline blue ). For this, three different types of water-soluble aniline blue can be produced ( water-soluble aniline blue, see below). These are the sodium salts of the sulfonic acids paired Triphenylrosanilins. They are obtained by the action of concentrated sulfuric acid to aniline blue and depending on the length of exposure and the level of temperature can in this case either 1, 2 or 3 molecules of sulfuric acid are bound. On dilution with water, these dyes are eliminated and can then be solved by means of sodium hydroxide solution. The sooner alone common water-soluble aniline blue contains 3 molecules of sulfuric acid, making it the most triphenylrosanilintrisulfosaure soda. The containing 2 molecules of sulfuric acid A., the triphenylrosanilindisulfosaure soda is called Blue Water ( Bleusoluble ). However, that is preparing same dye in other ways from diphenylamine, Bavarian Blue is called. It is a dark blue powder, while the water blue shows a coppery metallic luster. With one molecule of sulfuric acid, the triphenylrosanilinmonosulfosaure soda, which also comes in two types on the market, namely rosaniline prepared as Nicholson blue or alkali blue, and from diphenylamine prepared as alkali blue D. Both are dark blue powder, soluble in water with gorgeous blue color is produced.

Aniline blue is formed by heating rosaniline C20H21N3O with excess aniline and some benzoic acid at 180 ° C, the benzoic acid remains unchanged ( Monophenylrosanilin is red-violet, blue-violet Diphenylrosanilin, Triphenylrosanilin pure blue). The precipitated with hydrochloric acid aniline blue is the hydrochloric acid salt of the base. It forms green iridescent needles, is slightly soluble in hot alcohol and insoluble in water. It comes as Gentianablau, light blue, petrol blue, Opalblau, fine blue in the trade. It dyes wool greenish blue. With concentrated sulfuric acid it forms sulphonic acids. The monosulphonic C38H30N3 ( HSO3 ) is amorphous, blue, insoluble in water and forms colorless, non- crystallizable, readily soluble salts, of which the sodium salt ( blue, soluble A. Nicholson ) is used as alkali blue. It fixes from weakly alkaline solution on wool and silk, but needs to be brightened with dilute acid. Salts of water-soluble di-, tri-and Tetrasulfosäure make the water blue ( Opalblau, China Blue, Cotton Blue, Bavarian blue), they are blue in water, slightly soluble in alcohol and are particularly suitable for dyeing wool and silk and cotton, the is stained with alum and soap or with tannin and tartar emetic.

Disulfonic acid of aniline blue

Trisulfosäure of aniline blue

Aniline blue, water soluble

Aniline blue, water soluble ( CAS 8004-91-9 ) is a mixture of the two acidic triphenylmethane dye water blue and methylene blue. The chemical composition of the dye varies considerably with individual providers. Under this designation, the two individual components are often performed, all three dyes can be distinguished, however, on the CAS number.