FJC Air Conditioning Products 2480 1-Quart Universal PAG Oil with Fluorescent Leak Detection Dye. Compatible with R-134A and R-12. Compatible with Mineral, Ester, Paraffin and PAG Oil. Can be detected using a standard UV light. Saves time over existing methods of dye injection. Attention: A partial charge of PAG Oil with Dye will not provide enough dye for proper fluorescing. Only a full system charge during normal service will provide maximum fluorescing for the mobile A/C system. A partial charge may be added to a system which already contains Fluorescent Dye.