Lithol Rubine BK

  Lithol Rubine BK, Pigment Rubine, Carmine 6B, Brilliant Carmine 6B, Permanent Rubin L6B, Litholrubine, Latolrubine, C.I. Pigment Red 57, C.I. Pigment Red 57:1, D&C Red No. 7, or C.I. 15850:1, is a reddish synthetic azo dye. It has the appearance of a red powder, 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 usually comes as a calcium salt.

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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.

Its CAS number is [5281-04-9] and its SMILES structure is Cc1ccc(/N=N/c2c(O)c(C([O-])=O)cc3ccccc23)c(S(=O)([O-])=O)c1.