Fluorescent Leak Detection Dyes can be detected using any UV or Blue Light. It is used to trace where is leaking of Refrigerant. It can be detected for R12 and R134a. Our Fluorescent Leak Detection Dyes has different type of package. Standard package is 1/4 oz which is just for one car use. There are 1 oz, 4 oz, 8 oz and 16 oz etc. can be selected. Our Dye is good concentration to get precise leak information.