HenkaQmakes golf balls that change colors when exposed to sunlight. The base color of the balls is white but that can change to purple, yellow or varying shades of blue when the ultraviolet rays of the Sun hit them.
The surface of the balls has the same photo chromic compound which changing sunglasses use to get darker in brighter light. It’s nice to know that the core of your golf ball is protected from skin cancer.
Fred: “Hey Bob I think I found your ball! What color is it?”
Fred: “Nope, this one is purple…”
HenkaQ also makes a fluorescent golf ball for night use.