Indian Yellow

Indisch-gelb, n. Indian yellow, -hanftinktur,/. tincture of Indian hemp, -rot, n. Indian red. 

Indian yellow, fast yellow, azo flavine, brilliant yellow S, curcumine, orange II, palatine light yellow, wool fast yellow, azo acid yellow, azo yellow, etc. ° Solution becomes red or orange red. 

Nearly all phenylamidoazo-compounds yield nitro-derivativcs when their nitrosamines are carefully treated with nitric acid. The nitro-group enters into the diphenylaminCj, and certain bodies obtained in this manner are used under the names Azoflavine, Citronine, and Indian Yellow. They are distinguished from the original dyestuff s by their yellower shade. 

The magnesium salt is the essential constituent of the dyestuff known in commerce as Purree or Indian Yellow. This product is obtained from the urine of cows, fed on mango-leaves. The gold-yellow urine is heated, and the yellow deposit formed into a ball. This is purified by removing the outer portions and thoroughly washing the remainder. 

Its principal application is as an artists pigment under the name of Indian Yellow. 

Indian yellow. (l)(Aureolin) A yellow pigment distinguished by being unaffected by hydrogen sulfide. It is durable, without action on other pigments, and is permanent in oils and water-color. It consists of a double nitrite of cobalt and potassium and is prepared by adding excess of potassium nitrite solution to a solution of cobalt nitrate acidified with acetic acid. (2) Also sometimes used for the yellow synthetic dye primuline. 

Cobaltic Potassium Nitrite, Hexakis(nitrito-N)co-baltateiJ—) tripotassium potassium hexanitrocobaltateOll) potassium cobaltinitrite potassium nitrocobaltate(lll) cobalt yellow Fischer s yellow C.l. Pigment Yellow 40 C.I. 77357. CoKjNjOmol wt 452.29. Co 13.03%, K 25.93%, N 18.58%, 0 42.45%. K3Co(N02)6. incorrectly called Indian yellow". Prepd by addition of KNO, to a solution of a Co salt Salyer, Sweet, Anal. Chem. 32, 548 (1962). 

Euxanthinic add, euxanthone see Indian yellow. Evemic add ethyl ester see oak moss absolute. Eveniinoiiiidn see ziracin. 

Indian yellow n. Purree. A yellow pigment containing the magnesium salt of euxanthic acid. 

Euxanthic acid, a major constiment of so-called Indian yellow (. v.), will form salts with various elements however, those of calcium and magnesium are the ones commonly encountered. 

Xanlhones group Euxanthone Indian yellow Schweppe (1992) 430... 

Euxanthone, l,7-dihydroxy-9H-xanthen-9-one, a xanthone dyesmff, is derived from euxanthic acid and is a major dyestuff in the pigment Indian yellow qq.v.-, Schweppe, 1992). 

Berberine Calcium euxanthate Euxanthic acid Euxanthone Fisetin Indian yellow Luteolin Magnesium euxanthate Morin Quercetin Quercitron Rhamnus Weld Oldfustic, Rue] Young fustic Haibome Baxter (1999)... 

Synonym, variant or common name See Indian yellow. 

Perhaps the best description of the production of Indian yellow is that of Mukhajji (1883-84), who studied the process in Mirzapur, Monghyr, north-east Bihar, India. He describes how the urine was collected in small earthen pots, cooled, ftien concentrated... 

Numerous later nineteenth and earlier twentieth century sources also attest to an interest in the structure and synthesis of Indian yellow, extending from the 1844 publications of Erdmann and Stenhouse to those of Reindel and Anschutz and Karrer in 1947. However, although synthetic analogues of Indian yellow can be produced, ftiese do not appear to have been commercially supplied (Wehlte, 1975). 

According to the early nineteenth century colourman Field Madder yellow is a preparation from the madder-root. The best is of a bright colour, resembling Indian yellow, but more powerful and transparent (Field, 1835). Salter adds to this in his 1869 edition of Field s Chromatography that he had never been able to produce a comparable material, stating that It is certain that no true madder yellow, brilliant and pure, ranks as a pigment at the present day. A variety known as Cory s Yellow Madder may be briefly described as Cory s Brown Madder . 

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