LeakFinder offers fluorescent dye for all conventional coolants. These dyes are useful for locating leaks in radiators, hoses, heater cores, water pumps, and fittings. The LeakFinder coolant dye fluoresces green and is compatible with all leak detection flashlights (blue light, violet light, and ultraviolet light). The LEAKFINDER brand was designed to be a cost-effective solution for end-users in the automotive aftermarket. The LeakFinder product line is perfect for DIY jobs and small to mid-sized automotive repair shops. The ultraviolet fluorescent universal dye provides the most precise leak detection for all automotive air conditioning systems containing R-134a, R-1234yf, or other widely used refrigerants. Our dyes can find the smallest and most problematic leaks that would otherwise be impossible to detect.