This product is a ''ready-to-use'' 1X diluent for Horseradish Peroxidase (HRP) conjugated primary or secondary. This buffer contains Tris buffered saline, and proprietary reagents to stabilize and preserve Horseradish Peroxidase (HRP) conjugated primary or secondary antibodies in solution. A proprietary combination of preservatives is used that is azide and mercury free.