Ponceau 6R

This article is about Ponceau 6R. For other uses, see Ponceau (disambiguation).

Ponceau 6R

Names
Other names Ponceau 6R
Identifiers
CAS Number	2766-77-0
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL368082
ECHA InfoCard	100.018.584
E number	E126 (colours)
SMILES [Na+].[Na+].[Na+].[Na+].Oc1cc(c2ccccc2c1N=Nc3c(O)c(cc4cc(cc(c34)S(=O)(=O)[O-])S(=O)(=O)[O-])S(=O)(=O)[O-])S(=O)(=O)[O-]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ponceau 6R, or Crystal ponceau 6R, Crystal scarlet, Brilliant crystal scarlet 6R, Acid Red 44, or C.I. 16250, is a red azo dye. It is soluble in water and slightly soluble in ethanol. It is used as a food dye, with E number E126. It is also used in histology, for staining fibrin with the MSB Trichrome stain. It usually comes as disodium salt.

Amaranth is a closely related azo dye, also usable in trichrome staining.

Its CAS number is 2766-77-0 and its SMILES structure is OC1=C(N=N C3=C(C=CC=C4) C4=CC=C3)C2=C (C=C(S(=O) ([O-])=O)C=C2 S(=O)([O-]) =O)C=C1.