TMB ELISA Peroxidase Substrate (3, 3', 5, 5' - Tetramethylbenzidine) is a chromogenic substrate used to visualize antibody reactivity in ELISA experiments. In the presence of peroxidases, TMB can act as an electron donor for the conversion of peroxides to water, typically changing the color of solution to a blue color equivalent to the degree of reactivity and upon addition of acid, changing the solution color to yellow. This proprietary formulation of TMB ELISA Peroxidase Substrate is red in color, enabling users to have visual certainty that the product was applied equally. TMB ELISA Peroxidase Substrate is ideal for investigators in Immunology, Cancer, and Microbiology research.Synonyms: 3,3',5,5'-Tetramethylbenzidine; TMB-E; TMBE; RTMBE; R-TMB-E