Patent ID: 8110281

Claim:
A pigment particle comprising: a core having a carrier substance and at least one of a fluorescent material or a phosphorescent material; and a shell surrounding the core, the shell including a photochromic material which has a first optical property in a first light source and a second optical property in a second light source, the second light source includes ultraviolet wavelengths (UV) that are a set of wavelengths not sufficiently present in the first light source that triggers the second optical property, and wherein the second optical property attenuates an emitted radiation from the at least one of the fluorescent material or the phosphorescent material, and wherein initial exposure to the second light source causes the pigment particle to have a first appearance based on the emitted radiation from at least one of the fluorescent material or the phosphorescent material, and continued exposure to the second light source causes the pigment particle to have a second appearance based on the second optical property which attenuates the emitted radiation, wherein a transition from the first appearance to the second appearance dynamically occurs after the initial exposure.