Dye-Lite TP-3100 fluorescent dye pinpoints engine oil, hydraulic fluid, lubrication fluid, compressor oil and gearbox oil leaks. Simply add a small amount of TP-3100 dye to the system and allow it to circulate for several minutes. Wherever there is a leak, the dye escapes with the oil and accumulates. Scan the system with a high-intensity ultraviolet or blue light lamp, and the dye glows a bright yellow color to clearly reveal the location of all leaks-even small leaks undetected by other methods. After the leaks have been repaired, scan the system with the light again. If there is no glow, it means that all the leaks were fixed properly. TP-3100 dye can remain safely in the system until the oil is changed, making it ideal for preventive maintenance. Periodic inspections with the lamp will detect leaks before they can cause damage to the system.