A package for multi-instance photosensitive authentication includes a container, and a photochromic material non-removably carried by the container and irreversibly changeable upon exposure to ultraviolet (UV) light. The package also includes a UV protector carried over the photochromic material to protect the photochromic material from premature exposure to the UV light, and having multiple portions that are removable to expose multiple portions of the photochromic material to UV light and are irreplaceable once removed.