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The Day-Glo Color Corp. (also styled as DayGlo) is a privately held [1] American paint and pigments manufacturer based in Cleveland, Ohio. It was founded in 1946 by brothers Joseph and Robert Switzer and is currently owned by RPM International .
Luminous ink under ultraviolet light Fluorescent paintings lit by black light. Black light paint or black light fluorescent paint is luminous paint that glows under a black light. It is based on pigments that respond to light in the ultraviolet segment of the electromagnetic spectrum. The paint may or may not be colorful under ordinary light.
Switzer was co-inventor of the first black light fluorescent paint along with his brother Joseph Switzer and the inventor of the Magnaglo process for nondestructive flaw-detection in machined parts. The brothers founded the Day-Glo Color Corp. in 1946 to develop and manufacture fluorescent paints, pigments and other products.
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. Invisible fluorescent paints ...
DayGlo fluorescent pigments, developed by Bob Switzer and Joe Switzer of Switzer Brothers, Inc., (now Day-Glo Color Corp.) between the 1930s and 1950s [70] Rachel Carson's book Silent Spring, published in 1962 [71]
Two examples of fluorescent blacklight bulbs with light fixtures and packaging and a novelty incandescent bulb. Although blacklights date to 1903 with the development of the optical filter glass Wood's glass, fluorescent ink was not developed until 1932 when the Switzer brothers were inspired by a Popular Science magazine article to experiment in their father's pharmacy.
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