alizarine red

:  any of various red mordant or acid dyes most of which are derived from anthraquinone: such as a :  turkey red b :  an orange-yellow crystalline compound C₁₄H₇NaO₇S used chiefly for dyeing and printing aluminum-mordanted wool scarlet red, as a biological stain, and as an analytical reagent (as for detecting aluminum); sodium 3-alizarin-sulfonate —called also Alizarine Carmine, Alizarine Red S, Alizarine S