We use the UV dyes (oil, coolant, hydraulic fluid, etc.) from Uview, the guys that make the vacuum cooling system tools. All the various dyes are harmless to the fluid being checked, and can remain in the system without any problems, which is what makes them so useful.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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