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Or fluorescent dye and a UV flashlight?
If it's casual use glow tape
Flourescent /= glow
It will glow (produce it's own light), but only WHILE in UV light. The moment you turn off the light, you turn off the glow.
Duh?!?
If that's not what you were implying, then I don't see how your suggestion above would help at all.
Just dye it fluorescent and bring a UV light to search for it after you throw? Yeah, good luck with that. That'll work about as well as throwing a regular disc and then searching for it with a regular flashlight.