Merck, 11442074001, BM-Purple

BM purple is a chromogenic substrate for alkaline phosphatase (AP) designed for precipitating enzyme immunoassays. It develops a permanent, dark purple band or spot at the AP binding site on the membrane or solid support. The stabilized substrate solution may be used directly from the bottle with no mixing or reconstitution. It gives less background staining than when using the BCIP/NBT two-bottle system, without a loss of sensitivity. The reaction product has a dark purple color and is insoluble in water. The dark purple color can be visually seen. Appearance prior to use: light yellow color; After color development: dark purple