invisible ink
noun
: ink that can only be seen when it is specially treated in some way
a message written in invisible ink
Examples of invisible ink in a Sentence
Recent Examples on the Web
In the middle of 25th St, a man opens a red stanchion and ushers us toward a guard who stamps invisible ink on our wrists.
—
Kieran Press-Reynolds, Pitchfork, 24 Sep. 2025
In 2011, for example, the CIA finally declassified its recipe for invisible ink — from 1917.
—David Klepper, Los Angeles Times, 29 Mar. 2025
Mark your property: Use invisible ink or engrave your decorations with a unique identifier.
—Kurt Knutsson, Cyberguy Report, Fox News, 14 Dec. 2024
Voted the second-best city in the world by Condé Nast Traveler readers for 2024, Singapore has a few tenets written in invisible ink.
—Audrey Phoon, Condé Nast Traveler, 10 Dec. 2024
Roya had hosted a party the night before, which didn’t have a metal detector but did use invisible ink stamps to show who had been admitted.
—Sophie Brookover, Vulture, 31 Oct. 2024
America’s first spies spent the Revolutionary War using ciphers, clandestine courier networks, and invisible ink to correspond with each other and their foreign allies.
—William J. Burns, Foreign Affairs, 30 Jan. 2024
President Obama wrongly drew a red line with invisible ink.
—Laurence Needleman, WSJ, 21 Nov. 2023
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Kieran Press-Reynolds, Pitchfork, 24 Sep. 2025
In 2011, for example, the CIA finally declassified its recipe for invisible ink — from 1917.
—David Klepper, Los Angeles Times, 29 Mar. 2025
Mark your property: Use invisible ink or engrave your decorations with a unique identifier.
—Kurt Knutsson, Cyberguy Report, Fox News, 14 Dec. 2024
Voted the second-best city in the world by Condé Nast Traveler readers for 2024, Singapore has a few tenets written in invisible ink.
—Audrey Phoon, Condé Nast Traveler, 10 Dec. 2024
Roya had hosted a party the night before, which didn’t have a metal detector but did use invisible ink stamps to show who had been admitted.
—Sophie Brookover, Vulture, 31 Oct. 2024
America’s first spies spent the Revolutionary War using ciphers, clandestine courier networks, and invisible ink to correspond with each other and their foreign allies.
—William J. Burns, Foreign Affairs, 30 Jan. 2024
President Obama wrongly drew a red line with invisible ink.
—Laurence Needleman, WSJ, 21 Nov. 2023
Cite this Entry
“Invisible ink.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invisible%20ink. Accessed 3 Nov. 2025.
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