Onestep QuickBlu® TMB Substrate is a solution for the detection of horseradish peroxidase (HRP) that is manufactured as both a ready-to-use solution as well as in a concentrated form. It rapidly produces a blue-colored reaction product which can be read at 370 nm or 655 nm, or at 450 nm when an acidic stop solution is used. QuickBlu® TMB substrates are stable for up to 4 years at 2 - 8°C. Moreover, QuickBlu® TMB substrate sensitivity is excellent when compared to other leading products. QuickBlu® TMB substrates are manufactured to ensure that the lot-to-lot variability is less than 5%. The solution can be concentrated up to 10x for easy transportation.