Lithol Rubine BK
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Names | |
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IUPAC name Calcium (4Z)-4-[(4-methyl-2-sulfonatophenyl)hydrazono]-3-oxo-2-naphthalenecarboxylate | |
Other names
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Identifiers | |
CAS Number |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.023.736 ![]() |
E number | E180 (colours) |
PubChem CID |
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CompTox Dashboard (EPA) |
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InChI
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Properties | |
Chemical 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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). ![]() ![]() ![]() Infobox references |
Chemical compound
Lithol Rubine BK is a reddish synthetic azo dye. It has the appearance of a red powder and is 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 prepared by azo coupling with 3-hydroxy-2-naphthoic acid. 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, and it is a component in some lip balms.
References
- ^ K. Hunger. W. Herbst "Pigments, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a20_371
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