The FJC 6810 UV Fluorescent Leak Detection Dye is specifically designed for use in R-1234yf automotive air conditioning systems. This 1 oz. bottle of dye is a critical tool for mechanics and DIY enthusiasts, offering a fast and accurate method to locate refrigerant leaks. By integrating with the A/C system's oil and refrigerant, the dye circulates and exits through leaks, revealing the exact location with a vivid fluorescent color under UV light. Compatible with standard UV lamps and glasses, FJC 6810 ensures quick detection, allowing for prompt repairs, and is essential for maintaining optimal A/C performance."