Pinpoint leaks in A/C systems easily with Fluorescent Dye and a UV Light. Replacement flourescent dye designed to give best performance with your Robinair leak detection system. 12 pack, 1/4 oz. bottles. Universal A/C dye for use with mineral, ester and alkybenzene oils. Can be used with any UV lamp for detection of both R-12 and R-134a.