I noticed that some uv dyes are made for different applications. Some are for oil based products, transmissions, airconditioners, fuel systems, power steering. Make sure that the one you get is for water applications. Frankly as little dye needed to color a setup, it shouldn't change the properties of the water, but an oil based dye would mees you up.
Also, you will pay out the nose for "cooling" websites and uv dye. Just get the stuff they repackage from the leak detection stores.
DangerDens's resold dye .. bottom of page..
The real question would be
This KIT .. I think I want to try this. Anyone have any cautionary words?
I am new at uv dye myself. Any correction to my understandings are welcome.