Luminous paint or luminescent paint is paint that exhibits luminescence. Their blood is luminescent phosphor green in color. Gallium(III) oxide has been studied in the use of lasers, phosphors, and luminescent materials. They can sometimes be brightly coloured, and may be iridescent or even luminescent. Two types of luminescent phenomena are relevant to crystalline materials. Cathodoluminescence is light resulting from a luminescent material being struck by electrons. Wang held several patents related to the application of luminescent compounds and boron compounds. It is believed that these tubercles simply reflect light and are not luminescent. In dark surroundings, fragments are seen as luminescent spots. The material is also highly luminescent. Enraged, Mac initiates a firefight in which the creature is wounded, revealing luminescent green blood. They offer the possibility of incorporating luminescent components. Wang worked on the development of new Organometallic chemistry and luminescent materials chemistry. Derivatives of bipyridine and terpyridine are numerous, best known being the luminescent tris(bipyridine)ruthenium(II) chloride. Luminescent and nonluminescent strains can occur in the same species.