Unique formulations ideal for all oil based fluids. Dye fluoresces yellow-green under both ultraviolet and blue light. Works with any leak detection lamp. Super bright dye. Patented formula Dye-Lite All-In-One Dye works on engine oil, power steering, automatic transmission, fuel (gasoline and diesel) and hydraulics. (6) 1 oz bottles - Each bottle treats 1 vehicle for convenient single billable service. Patented formulation works with ANY leak detection lamp. Glows bright!