Tracer Spectronics Corp TP39400601 Rite-Blend Extended Life Coolant Dye (For Water Based Fluids) Case of (6) 1 oz. bottles Ford-approved, fluoresces bright green, requires a long wave UV lamp such as the TP-1600P, TP-1700P or TP-35000 Maxima series For use with all coolants, including red/orange or yellow extended life coolants Safe to remain in the system until the coolant is changed