Radioluminescent paint was invented in 1908 and originally incorporated radium-226. They are therefore sometimes referred to as "self-luminous". Radioluminescent paints will glow without exposure to light until the radioactive isotope has decayed (or the paint itself degrades), which may be many years. The isotopes selected are typically strong emitters of fast electrons ( beta radiation), preferred since this radiation will not penetrate an enclosure. Radioluminescent paint contains a radioactive isotope combined with a radioluminescent substance. It is also increasingly used as an alternative to radioluminescent paint. ![]() This type of paint has been used to mark escape paths in aircraft and for decorative use, such as "stars" applied to walls and ceilings. Phosphorescent paints have a sustained glow which lasts for some minutes or hours after exposure to light, but will eventually fade over time. The mechanism for producing light is similar to that of fluorescent paint, but the emission of visible light persists for some time after it has been exposed to light. It is made from phosphors such as silver-activated zinc sulfide or, more recently, doped strontium aluminate, and typically glows a pale green to greenish blue color. Phosphorescent paint is commonly called "glow-in-the-dark" paint. This type of paint has extensive applications in the entertainment industry, and it can be used to create black-light effects such as invisible images, dual images, day–night transitions, and 3-D effects. ![]() Invisible fluorescent paint appears white or clear under white light, but glows a particular color-depending on the pigment used-under black light. Visible fluorescent paint can appear any bright color under white light, and glows brilliantly under black light. There are two basic kinds of fluorescent paint: visible and invisible. ![]() Through the mechanism of fluorescence, UV-sensitive pigments present in the paint absorb black light and give off visible light in return. In other words, it gives off visible light through fluorescence, phosphorescence, or radioluminescence.įluorescent paint reacts to long-wave ultraviolet (UV) radiation, commonly known as black light. Luminous (or luminescent) paint exhibits luminescence.
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