Alizarin brown

Anthracene acid brown, acid anthracene brown, acid alizarine brown, anthracene chromate brown, diamond brown, acid chrome brown, palatine chrome brown, sail cine brown, oxy-chrome brown, metachrome brown, monochrome brown, mercerol brown, etc Also Man ganese brown (Mh in ash). 

Anthragallol has a brown colour, and dyes brown shades on alumina or chromic oxide. The commercial Alizarin Brown is a mixture of anthragallol with more or less rufigallic acid. 

Quinone Colors depend on mordant and pH 1. benzoquinone 2. naphthaquinone 3. anthraquinone Carthamine Juglone Alizarin Purpurin Walnut or butternut (Juglans sp.) Rubiaceae family Sorrel (Rumex sp.) Poligonaceae family Forms lake with mordant For 3. pH >7 -> violet-blue pH < 7-> yellow-red AL rose-red Ca bluish-red Zn red-violet Fe black-violet Cr=red brown... 

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

U Coprosma luclda On the chromatogram are two prominent spots, viz. a violet-brown spot roughly at the level of alizarin, and a gray-brown spot near the starting line. These two spots could not be identified, because reference compounds were not available. 

Phenolphtha- lein Alizarin yellow 0.1 and 1.0 60% Ethanol Colourless to red Yellow to violet Yellow to orange-brown 8.2-10... 

The use of alizarin as a dye depends upon the fact that with mor- dants of metallic oxides it forms insoluble lakes which are deposited on the fibers of the cloth and thus dye it. These lakes are of different colors depending upon the metallic salt used. Aluminium gives a red color known as Turkey red. Ferrous iron gives hlack-molet and ferric iron a brown-black. Tin produces a red-violet color as stannous salts and a violet as stannic. Chromium salts give a brown-violet color. 

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. 

This compound is a trioxyacetophenone (OH)3C6H3COCHg, obtained by heating pyrogallol with acetic acid and zinc chloride to 150°. It may be used for printing with chromium acetate, and gives brown shades [23]. It is named Alizarin Yellow G. 

Brazilin is applied technically in form of extract or decoction of brazil-wood. It can be fixed only by use of mordants, and is used both in cotton and wool dyeing. On alumina mordants it produces shades resembling alizarin, but inferior both in beauty and fastness. The tin lake has a brighter colour. Wool mordanted with potassium bichromate is dyed a fine brown shade. 

The salts are intensely coloured. The red aluminium salt, the violet ferric salt, and the garnet-brown chromic salt are especially important in dydng. With alizarin and all its related compounds the dyeing is effected by mordanting the fibre with a salt of one of the... 

Parts nile blue 0.1% in water 1 Part alizarine yellow 0.1% l0.8 green red-brown ... 

Sodium alizarine sulfonate. The interval in water is in the range 3.7-5.2 (yellow to violet). The indicator has a brown color in a 99.7% alcohol solution. In the presence of alkali, the color is red-brown instead of violet as in water. 

Alizarin Yellow R [5-(4-nitrophenylazosalicylic acid). Mordant Orange I] [2243-76-7] M 287.2, m 253-254"(dec), >300", Cl 14030, pK 11.17. The free acid is precipitated by adding HCl to an aqueous solution of the Na salt. After 2 recrystallisations from aqueous AcOH, it has m 255°(dec) [m 253-254°(dec) was reported by Hewitt Fox J Chem Soc 79 49 1901], The free acid recrystallises from dilute AcOH as orange brown needles. The Na salt changes colour from yellow to red when the pH is increased from... 

Yellow-brown to dark brown crystals easily oxidized to alizarin, mp 208° not sublimable. Slightly so) in water or benzene freely sol in alcohol, erber. acetone glacial acetic acid- Dissolves in alkalies with gteenish-yellow color in coned H>S04 with golden-yellow color. therap Cat Parasiticide. 

Alizarin Basic brown 4, dihydrochloride Basic green 1 Basic violet 3 Basic violet 10 Curcumin D C Orange No. 4 D C Red No. 19 Direct blue 1 Direct blue 6 Direct blue 15 Direct blue 218 Direct red 2 Direct yellow 11 Malachite green oxalate 1-(Phenylazo)-2-naphthylamine Ponceau 3R Trypan blue... 

Alizarin blue was prepared from nitroalizarin, glycerol, and sulphuric acid by M. Prud homme, anthragallol (anthracene brown, i a 3-trihydroxy-anthraquinone) from pyrogallol and phthalic anhydride by C. Seuberlich, di- (or tetra-) azo dyes by Caro and Schraube, rhodamine from ammonium thiocyanate and chloracetic acid by M. Nencki, rocelline or echtrot (naphthalene sulphonic azonaphthol) by Roussin (1877) and Caro and Griess, and methylene blue by Caro (1877). ... 

The effect of metal ions as mordants for anthraquinone dyes has been noted for many years. Alizarin was usually dyed on wool mordanted with aluminum to give red shades, or mordanted with chromium which produced browns and violet-browns. A typical dyeing recipe involved the slow heating of wool, alum and potassium acid tartrate, followed by addition of alizarin and calcium acetate. 

Brown needles from EtOH. M.p. 226-7°. Sol. EtjO, EtOH, CgHj, Py. Sol. alkalis with bluish-violet ool. Insol. H3O. Sol. oono. H3SO4 with olive-green col. Hot ale. HNO3 or HjAsOg —> 1-hydroxyanthraquinone. KOH fusion —V alizarin. 

Azoflavlne RS, Chrome fast yellow. Ponceau 4, Acid brown R, Alizarin yellow. Orange 1, Naphtol black. Ponceau S extra, and other dyes H 1213.214,2151... 

The complex between zirconium and alizarine red S (sodium 3,4-dihydroxy-9,10-dioxo-2-anthracene sulfonate. Figure 6.2) gives red-brown color in acid solution if alizarine red S is in excess and violet color if the zirconium is in excess. The complex is decolorized by fluoride ions. Phosphate, arsenate, sulfate, thiosulfate, and oxalate as well as organic hydroxy acids interfere with this reaction. 

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