Vat Yellow 4

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Vat Yellow 4
Skeletal formula
Ball-and-stick model
CAS number 128-66-5 N
PubChem 31412
ChemSpider 29142 YesY
KEGG C19545 YesY
Jmol-3D images Image 1
Molecular formula C24H12O2
Molar mass 332.35 g mol−1
Appearance viscous orange liquid
Density 1.418g/cm3
Boiling point 606.7 °C (1,124.1 °F; 879.9 K) at 760 mmHg
Solubility in water soluble
Main hazards Possible carcinogen
Flash point 219.93 °C (427.87 °F; 493.08 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Vat Yellow 4 is a yellow synthetic anthraquinone vat dye. It is a bright yellow solid, although commercial samples can be viscous orange liquid. This dye is used mostly as a dye for textiles and paper. Together with benzanthrone, it is used in some older pyrotechnic compositions for green and yellow colored smokes. It is produced from a suitable dibenzoylnaphthalene by oxidative (dehydrogenative) ring closure.[1]


Vat Yellow 4 is a Group 3 carcinogen according to the IARC, as the evidence of its carcinogenity to humans is inadequate.


  1. ^ Bien, H.-S.; Stawitz, J.; Wunderlich, K. (2005), "Anthraquinone Dyes and Intermediates", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a02_355