[‚an·thrə′pər·pə‚rin] (organic chemistry) C6H3OH(CO)2C6H2(OH)2 Orange-yellow, crystalline needles with a melting point of 369°C; soluble in alcohol and alkalies; used in dyeing.
anthrapurpurin
an·thra·pur·pu·rin
(an'thră-pūr'pū-rin), A purple dye used in histology as a reagent for calcium, although the specificity has been questioned.