They’re the ultimate in counterfeit protection: fluorescent inks that you can’t remove, copy or even see without special equipment. Made by Boston-based startup PhotoSecure, the inks can be applied to cloth, paper, metal, shrink-wrap and more. To increase security, PhotoSecure’s readers not only check the color of light that the ink emits but also measure the amount of time it takes the inks to start and stop glowing. PhotoSecure hopes to market the technology to makers of products like clothing, software, pharmaceuticals, cosmetics, electronics and auto parts. Titleist, PhotoSecure’s first customer, plans to use the inks to code its golf balls with information such as the identity of a club buying balls in bulk. With PhotoSecure’s readers, it can then go into stores and figure out which clubs are reselling the balls at a profit.