Lithol Rubine BK

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Lithol Rubine BK
CAS number 5281-04-9 YesY
PubChem 9571018
ChemSpider 17215383 YesY
Jmol-3D images Image 1
Molecular formula C18H12CaN2O6S
Molar mass 424.44 g/mol
Appearance Red powder
Solubility in water slightly soluble in hot water, insoluble in cold water and ethanol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Lithol Rubine BK is a reddish synthetic azo dye. It has the appearance of a red powder and magenta when printed. It is slightly soluble in hot water, insoluble in cold water, and insoluble in ethanol. When dissolved in dimethylformamide, its absorption maximum lies at about 442 nm. It is usually supplied as a calcium salt.[1]

It is used to dye plastics, paints, printing inks, and for textile printing. It is normally used as a standard magenta in the three and four color printing processes.

When used as a food dye, it has E number E180. It is used to color cheese rind as well as a component in some lip balms. It is banned in some countries.[citation needed]


  1. ^ K. Hunger. W. Herbst "Pigments, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a20_371