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Fluorescent security strip in a US twenty dollar bill under UV light. Strongly fluorescent pigments often have an unusual appearance which is often described colloquially as a "neon color" (originally "day-glo" in the late 1960s, early 1970s). This phenomenon was termed "Farbenglut" by Hermann von Helmholtz and "fluorence" by Ralph M. Evans. It ...
The fluorescent dyes cause a chemical reaction when exposed to high intensity light sources (HILS) and the visual result is a fading in the colors of the inks. With paper, significant visible change in the color saturation can typically be observed within 45 minutes to one hour of exposure to the HILS.
Fluorescent paints are best viewed in a darkened room. Fluorescent paints are made in both 'visible' and 'invisible' types. 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.
(top) a 1,2,3,3-tetramethyl-3H-indolium salt and (bottom) aniline derivative of squaraine dyes. Squaraine dyes are a class of organic dyes showing intense fluorescence, typically in the red and near infrared region (absorption maxima are found between 630 and 670 nm and their emission maxima are between 650–700 nm).
Tide detergent became known for its fluorescent packaging beginning in 1959, but other products such as clothing, posters and hula hoops also used fluorescent colors. [ 4 ] [ 5 ] Daylight fluorescent pigments were also used in safety products such as construction cones , street signs and safety vests due to their high visibility.
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Pigments for sale at a market stall in Goa, India. A pigment is a powder used to add color or change visual appearance. Pigments are completely or nearly insoluble and chemically unreactive in water or another medium; in contrast, dyes are colored substances which are soluble or go into solution at some stage in their use.
DPPs were initially used as pigments in the painting industry (e.g. in automotive paints) due to their high resistance to photodegradation. More recently, DPP derivatives have been also investigated as promising fluorescent dyes for bioimaging applications, [ 4 ] as well as components of materials for use in organic electronics .