Invisible fluorescent paints appear transparent or pale under daytime lighting, but will glow under UV light. Visible fluorescent paint also has ordinary visible light pigments, so under white light it appears a particular color, and the color just appears enhanced brilliantly under black lights. Fluorescent paints are best viewed in a darkened room.įluorescent paints are made in both 'visible' and 'invisible' types. It has a dark blue filter material on the bulb which lets the invisible UV pass but blocks the visible light the bulb produces, allowing only a little purple light through. So viewing fluorescent paint requires a longwave UV light which does not emit much visible light. The painted surface also reflects any ordinary visible light striking it, which tends to wash out the dim fluorescent glow. Human eyes perceive this light as the unusual 'glow' of fluorescence. The fluorescent chemicals in fluorescent paint absorb the invisible UV radiation, then emit the energy as longer wavelength visible light of a particular color. Fluorescent paint is available in a wide range of colors and is used in theatrical lighting and effects, posters, and as entertainment for children. These UV wavelengths are found in sunlight and many artificial lights, but the paint requires a special black light to view so these glowing-paint applications are called 'black-light effects'. Fluorescent paints 'glow' when exposed to short-wave ultraviolet (UV) radiation.
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