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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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
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