luminous paint
noun
: a paint containing a phosphor (such as zinc sulfide activated with copper) and so able to glow in the dark
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In 1916, the United States Radium Corporation opened a factory in Orange, NJ and hired 70 young women to paint numbers on wristwatches with luminous paint.
—
Sarah Watts,
Discover Magazine,
23 Mar. 2018
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Sarah Watts,
Discover Magazine,
23 Mar. 2018
Cite this Entry
“Luminous paint.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/luminous%20paint. Accessed 6 Jul. 2026.
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