Description_x000D_ General description_x000D_ TMB is a substrate for horseradish peroxidase. The substrate system will react with sites on the membrane containing peroxidase, producing an insoluble permanent dark blue reaction product. To stop the reaction, rinse the membrane with reagent quality water. This substrate is not recommended for microwell or immunohistochemical applications._x000D_ Caution_x000D_ Stable at least one year at 2-8 °C._x000D_ Physical form_x000D_ Ready-to-use.