https://www.techpowerup.com/297250/alphacool-unveils-glow-in-the-dark-apex-series-coolant
 
Alphacool brings color into the game and presents with the Apex Liquid a new colorful coolant in the company's own range. The ready-to-use mixture in red or blue can be used directly from the bottle and contains all additives that effectively protect the water loop from corrosion, limescale and other contaminants. The UV-active version of the Apex Liquid provides the real wow effect. The UV reactivity with UV LEDs or cathodes is outstanding and creates great effects in acrylic coolers, HardTubes, SoftTubes and reservoirs. With Alphacool's Apex Liquid you treat your water cooling system to a visual highlight with best cooling performance.
 
Technical data

• Properties great thermal conductivity: low electrical conductivity
• Content 1000 ml
• Color red & blue

The glow in the dark effect looks great. 

the_Scarlet_one
So is it UV reactive, or glow in the dark?

They say UV-active glow in the dark, meaning once light is removed it will continue to glow.

But they also say that it is UV reactive meaning it would require a black light led or cathode to get it to work, making it not a glow in the dark product.

The bottle in the picture says ""UV Active" so I assume that the UV lighting is needed.