Bismarck brown

Bismarck brown, Basic Brown 1 Basic azo-dyestuff, dyes wool (reddish brown), used for cotton with tannin as mordant. Used as hair dye. 

Basic, forms a stable water-soluble dihydrochloride. Diazotization gives brown azodyes (Bismarck brown) owing to the coupling of the partially diazotized base with the excess of diamine. Is also used as an end component of many azo-dyes, readily coupling with one or two molecules of diazo compound. 

Primary aromatic diamines cannot be diazotised (tetrazotised) and coupled normally. Thus o-])henylenediamiiie yields a triazole derivative and m-phenylenediamine gives an azo dye (Bismarck brown) by selfcoupling. 

Amido-azo-benzene Amido-azo-toluene Aniline black Auramine Bismarck brown Brilliant indigo, 4 G. 

Reacimj.—Dissolve a few ciystals in water, acidify with dilute hydrochloric acid, and add a drop of sodium nitrite solution. A deep biown solution (Bismarck brown) is obtained. See Appendix, p. 279. 

There are, however, a few diazonium salts which couple with the parent base even in acid solution, e.g. m-phenylenediamine (Bismarck brown). 

Coomassie Brilliant Blue R250 Combined with Bismarck Brown R... 

Gels are stained very sensitive and quick by combination of Coomassie Brilliant Blue R250 with Bismarck Brown R (Basic Brown4 C.1.21010). In our opinion, this is the best staining method using organic dyes. 

A 0.2 g Coomassie Brilliant Blue R250 are dissolved in 40 ml methanol or non-denaturated ethanol then 10 ml glacial acetic acid are added and the solution is filled up to 100 ml with deionized water. Stable at RT B 0.05 g Bismarck Brown R are dissolved in 40 ml methanol or non-denaturated ethanol then 10 ml glacial acetic acid are added and the solution is filled up to 100 ml with deionized water. Stable at RT. 

Sensitivity is about twice the standard protocol without Bismarck Brown. 

BMIbuildmgblocks [COMPOSITEMATERIALS - POLYMER-MATRIX - THERMOSETS] (Vol 7) Bismarck Brown G [10114-58-6]... 

Brown and black lakes are made with logwood and iron salts, with cutch or with Bismarck brown. 

Bismarck brown, vesuvine, phenylene brown, Janus brown, -tannin brown a 3 ... 

Vesuvin and Bismarck Brown products are obtained when rn -phenylenedia-mine, 2,4- and 2,6-diaminotoluene, or mixtures thereof are treated with nitrite in acidic solution, or when a mixture of the amines and nitrite is acidified. The final products consist of mixtures of monoazo, disazo, and polyazo dyes, with the dis-azo species probably predominating in commercial products. The dye is salted out immediately after its formation, and thereby the formation of polyazo dyes is prevented. 

Phenol was used by Lister as an antiseptic in surgery and aniline became the basis for the dyestuffs industry. It was this that really started the search for new organic compounds made by chemists rather than by nature. A dyestuff of this kind—still available—is Bismarck Brown, which should tell you that much of this early work was done in Germany. 

The azo in the name of DEAD refers to two nitrogen an azo group in them—Bismarck Brown (mentioned in... 

Azo Bordeaux Alkaline Violet Bismarck Brown Extra... 

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