BCIP (5-Bromo-4-chloro-3-indoxyl phosphate, disodium salt) is the most widely used chromogenic phosphatase substrate, which forms a dark blue (&lambda;_max 615 nm) precipitate on enzymatic hydrolysis. It is often used with the oxidant NBT (nitro blue tetrazolium chloride), which facilitates the precipitation.<ul> <li>White solid soluble in water</li> <li>Store at 4&deg;C and protect from light</li> <li>C₈H₄BrClNNa₂O₄P</li> <li>MW: 370.5</li> <li>[102185-33-1]</li></ul>