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Tracerline® fluorescent dye greatly improves leak detection in all oil-based systems, including hydraulic and coolant fluids, the company says. All-In-One™ dye is effective due to a blend of both yellow and green fluorescent dyes. One dye fluoresces best under UV light and the other under blue light. Regardless of the type of inspection lamp used, full spectrum All-In-One dye will glow brightly to pinpoint even the smallest leaks, the company says. The dye is super-concentrated, so only half as much is needed for most applications.