Acid Red 92

Safety Information

Acid red 92, when certified by the Food and Drug Administration (FDA), is referred to as red 27 and can be used in coloring cosmetic products. Please refer to red 27 for more information on the certified color.

Additional information about the safety of hair dyes.

In the European Union, acid red 92 as CI 45410 is permitted for use in cosmetic products (see Annex IV).


Acid Red 92

What Is It?

In cosmetics and personal care products, acid red 92 is used in the formulation of hair coloring products.

Why Is It Used?

Acid red 92 imparts color to hair. The exact color obtained will depend on the other ingredients that are used in the preparation and the starting color of the hair.

Scientific Facts

Acid red 92 is a synthetic pigment sometimes referred to in general terms as a xanthene color.

Hair dyeing formulations belong to three categories – temporary, semi-permanent and permanent coloring of hair. The permanent hair dyeing formulations are often referred to as oxidative hair dyes which are generally marketed as two-component products. One component contains the compounds (precursors) that become the colorants and the other component is a stabilized solution of hydrogen peroxide. The two components are mixed immediately prior to use. The precursors and peroxide diffuse into the hair shaft, where color formation takes place after the ingredients combine to produce the coloring mixture. The precursors are oxidized by the hydrogen peroxide to form the colorant molecules. These molecules are too large to escape from the hair structure. The hydrogen peroxide in the oxidative hair dye product also serves as bleaching agent for the natural pigment of the hair. The color that is formed depends on the precursors and direct dyes present in the dyeing solution, pH of the dyeing solution and the time of contact of the dyeing solution with the hair.