Blacklight paint or blacklight-reactive paint is paint that glows under a blacklight (a source of light whose wavelengths are primarily in the ultraviolet range). The paint may or may not be colorful under ordinary light. This article does not cite its references or sources. ... Spectrum of a fluorescent black light source. ... Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. ...

Such paints and inks are commonly used in the production of blacklight posters. Under daylight, the ultraviolet light ordinarily present makes the colors especially vivid. Under blacklight (with little or no visible light present), the effect produced can be psychedelic. 1942 US government war poster. ... The word psychedelic is a neologism coined from the Greek words for mind, ψυχη (psyche), and manifest, δηλειν (delein). ...

Blacklight paints are sometimes used in the scenery of amusement park dark rides. A blacklight illuminates the vivid colors of the scenery, while the vehicle and other passengers remain dimly lit or barely visible. This can enhance the effect of being in a fantasy world. Germany Pavilion, part of the Epcot Center theme park in Orlando, Florida Amusement park (also called theme park) is the generic term for a collection of rides and other entertainment attractions assembled for the purpose of entertaining a fairly large group of people. ... A dark ride or darkride is an indoor amusement ride consisting of a vehicle traveling past animated scenes. ... A fantasy world is a type of fictional universe in which magic or other similar powers work. ...

Blacklight paints are always fluorescent. More rarely, they may also be phosphorescent, containing a phosphor that continues to glow for a time after the blacklight has been removed. Fluorescence induced by exposure to ultraviolet light in vials containing various sized cadmium selenide (CdSe) quantum dots. ... Phosphorescent powder under visible light, ultraviolet light, and total darkness. ... A phosphor is a substance that can exhibit the phenomenon of fluorescence (glowing during absorption of radiation of another kind) or phosphorescence (sustained glowing without further stimulus). ...

"Day-Glo" is the trade name of the original product, invented by Bob Switzer. Robert C. Switzer usually known as Bob Switzer (born Ohio; died 1997) was the inventor of the first fluorescent blacklight paint which he called Day-Glo. ...

"Day-Glo" is also a the name for a noise music project in Indianapolis, Indiana.