2',4',5',7'- tetrabromofluorescein

2',4',5',7'-Tetrabromofluorescein (CAS 15086-94-9), commercially recognized as D&C Red #21, is a brominated xanthene dye approved for use in cosmetic and personal care formulations. Its bromine-rich structure also positions it as a functional additive in polymer and textile systems where color and flame-retardant properties are required simultaneously.

In cosmetics, D&C Red #21 delivers a distinctive pink-to-red fluorescent tone in lip products, blushes, and nail preparations, where its color-shift behavior on skin is a valued attribute. Polymer compounders incorporate it into plastics where both coloration and halogen-based flame retardancy are specified in a single additive for industrial manufacturing.

Textile and paper processors use it as a surface-active colorant, where its wetting behavior supports even dye distribution across various substrates and fiber types. In printing and packaging inks, it contributes vivid fluorescent hues to specialty formulations targeting high-visibility or decorative end uses for consumer goods.

2',4',5',7'-Tetrabromofluorescein is supplied as a fine powder. It is available in cosmetic-grade quality meeting D&C colorant specifications as regulated by the FDA. Technical-grade material is also available for industrial polymer and textile applications. Packaging typically ranges from kilogram quantities to bulk drum supply.