Ponceau 6R, or Crystal ponceau 6R, Crystal scarlet, Brilliant crystal scarlet 6R, Acid Red 44, or C.I. 16250,[1][2] is a red azo dye. It is soluble in water[2] and slightly soluble in ethanol. It was used as a food dye, formerly having E number E126. It is also used in histology, for staining fibrin with the MSB Trichrome stain.[2] It usually comes as disodium salt.
Amaranth is a closely related azo dye, also usable in trichrome staining.
References
- ^ PubChem. "Crystal Ponceau 6R". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-11-26.
- ^ a b c "Crystal ponceau 6R, red powder C.I. 16250". VWR. Retrieved 2022-11-26.