Vector Laboratories offers two lines of Horseradish peroxidase (HRP) substrates. Our original HRP substrate kits: Provide sensitivity greater than conventional substrates Are known for their consistency and reliability Supplied as concentrated stock solutions in convenient dropper bottles, stable for one year   The ImmPACT® line of HRP substrates offers the following advantages: 2-4 fold greater sensitivity than the original … Continue reading Peroxidase (HRP) Substrates