OCIA.net takes a look at the Zerex Super Coolant Water Additive in their latest review.

Of course once I powered on the system, everything mixed together as anticipated. In a pure distilled water system, the Zerex would give the kit a mellow pinkish look. In the test rig, however, with the UV dye already mixed in, we had some interesting effects. Under UV light, the color of the liquid in the reservoir was still green, but less UV reactive than before.

Zerex Super Coolant Water Additive Review