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Aniline Yellow
Skeletal formula
Ball-and-stick model
CAS number 60-09-3 YesY
PubChem 6051
ChemSpider 5828 YesY
EC number 200-453-6
KEGG C19187 YesY
ChEBI CHEBI:233869 YesY
Jmol-3D images Image 1
Molecular formula C6H5N=NC6H4NH2
Molar mass 197.24 g/mol
Melting point 123-126 °C
Boiling point > 360 °C
Main hazards Highly toxic
Cancer suspect agent
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g., sodium chloride Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Aniline Yellow is a yellow azo dye and an aromatic amine. It is a derivate of azobenzene. It has the appearance of an orange powder. Aniline Yellow was the first azo dye. it was first produced in 1861 by C. Mene. The second azo dye was Bismarck Brown in 1863. Aniline Yellow was commercialized in 1864 as the first commercial azo dye, a year after Aniline Black. It is manufactured from aniline.


Aniline Yellow is used in microscopy for vital staining,[1] in pyrotechnics for yellow colored smokes, in yellow pigments and inks including inks for inkjet printers. It is also used in insecticides, lacquers, varnishes, waxes, oil stains, and styrene resins. It is also an intermediate in synthesis of other dyes, e.g. chrysoidine, indulines, Solid Yellow, and Acid Yellow.

Toxic oil syndrome[edit]

Aniline Yellow was involved in the 1981 Spanish Toxic Oil Syndrome (TOS). A Madrid-based company imported denaturated rapeseed oil, dyed by aniline yellow to mark it as unsuitable for human consumption, to be used as a fuel in steel mills. However, the company distilled the oil to remove the dye, and sold it as a much more valuable olive oil for cooking. The result was a rash of pneumonia-type illnesses, with a second stage with lesions, weight loss, paralysis, and muscle wasting. The net result was over 20,000 sick and 400 dead. The chemistry of the poisonous reaction is still subject of a debate.[2]


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