Here, the electron returns slowly to its original energy state and this delayed fluorescence is called phosphorescence. These unique properties of UV fluorescence and phosphorescence are but two of the many ultraviolet phenomena that make it vital to science and law enforcement. Examination of physical evidence under UV light includes just about everything. Silver nitrate, physical developer and DFO development of fingerprints are enhanced with UV light. The use of fluorescent tracer powders, pastes and inks in conjunction with UV light enhance theft detection and security.
Imagination is the only limiting factor.