Formula: C8H6NO4BrCIP x C7H9N, Molecular weight: 433.6 BCIP-T (5-bromo-4-chloro-3-indolyl phosphate, p-toluidine salt) is a chromogenic substrate for alkaline phosphatase used in conjunction with the oxidant NBT (nitro blue tetrazolium, #R0841) to enhance blue color development.