No, these babies don't glow in the dark like a psychedelic poster under an ultraviolet light!
Instead, they sport a stealthy black finish to help reduced unwanted reflected light...this makes it easier for your eye to detect high or low spots when checking a ski or snowboard base for flatness.
They are made with hefty 5/8" (15mm) square hardened steel with clean crisp edges.
If you handle and store it with proper care it will serve you a lifetime.
For those not so careful, you can drop it as much as three times and still have a useable edge...we do alot of drop testing around here...grrr.