Possibly the simplest water-cooling question since the last Ice Age
 

OK, no laughing now.

What is put into those tubes to make them all glow in the dark with so many cool colors?

I said no laughing!

It is not normally the liquid, but the tubing itself that is uv reactive.

you can get dye, but it can stain tubes an clear resevoirs Ive read.

Plus dye can clog up the system i've heard... UV would be the way to go.

Dunno if this still works but you can whipe some Tide detergent on your tubing and it'll glow under a UV light.

Thanks for the replies. Glow-in-the-dark tubing, who would'a thought!