After years of attempts, we finally have found a dye that can make Whoop frames blacklight-reactive!
Seriously I have wasted a lot of frames and dyes trying to get this to work! I finally found a dye from a frisbee dye company that works great, mostly :)
The Yellow and the Green varieties are the brightest in black light, but all of them will glow brightly in UV Light. I made these frames to be paired with UV Leds that can shine directly onto the frame, but you don't need that if you're flying on a blacklight course!