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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 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 ...
[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. [3] DayGlo pigments were popularized in the 1960s by their extensive use in psychedelic art, such as the album artwork for Cream's 1967 album Disraeli Gears.
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.
Copper pigments. Han purple: BaCuSi 2 O 6. Cobalt pigments. Cobalt violet (PV14): Co 3 (PO 4) 2. Manganese pigments. Manganese violet: NH 4 MnP 2 O 7 (PV16) manganic ammonium pyrophosphate. [2] Gold pigments. Purple of Cassius: Gold nanoparticles suspended in tin dioxide - Au x • SnO 2. Arsenic pigments. London purple As 2 O 3. [3]
Specifically designed substituents also allows xanthenes to bear specific functions activatable upon excitation by visible light, e.g. they could act as photoremovable protecting group for carboxylates and halides, [7] carbon monoxide (thus being a photoCORM), [8] or added as a secondary functionality of fluorescent dyes, e.g. fluorescent pH ...
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