Metallographic HRP Substrate: Detection Kit for IHC/ISH designed for use with horseradish peroxidase (HRP) conjugates for the sensitive, high-resolution visualization of target proteins and nucleic acids in biological specimens. EnzMet? produces black, sharply defined and non-diffusing stains with high sensitivity and resolution. Staining is permanent, does not fade with time, and is readily distinguished from commonly used stains and counterstains.