invisible ink

(redirected from invisible inks)

invisible ink

n.
Ink that is colorless and invisible until treated by a chemical, heat, or special light. Also called sympathetic ink.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

invisible ink

n
(Chemistry) a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

invis′ible ink′


n.
a writing fluid that is invisible until treated, as by heat or chemicals.
[1675–85]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations

invisible ink

n → inchiostro simpatico
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
Mentioned in ?
References in classic literature ?
It was not long before I observed that it was the most susceptible part of her face, and that, when she turned pale, that mark altered first, and became a dull, lead-coloured streak, lengthening out to its full extent, like a mark in invisible ink brought to the fire.
View in context
If her faithful slate had had the latent qualities of sympathetic paper, and its pencil those of invisible ink, many a little treatise calculated to astonish the pupils would have come bursting through the dry sums in school-time under the warming influence of Miss Peecher's bosom.
View in context
These souvenirs, half effaced and almost obliterated by excess of suffering, were revived by the sombre figure which stood before her, as the approach of fire causes letters traced upon white paper with invisible ink, to start out perfectly fresh.
View in context
SPYING used to be about secret codes and invisible inks. Now it's about Facebook and Twitter.
Web of terror
In June 1915, Walter Kirke wrote that Mansfield Cumming, the first chief of the SIS, was "making enquiries for invisible inks at the London University".
Spooks at MI6 discovered the bodily fluid could be used as an invisible ink, as it glows brightly under UV light but does not react to detection chemicals.
Brit spies used semen to write top-secret letters
The technology allows the creation of holograms, hard-to-copy trademarks, invisible inks and unique threads to DNA-mark yarn, woven fabrics, threads, labels and finished garments.
FAKES DNA TRAP; Textile centre becomes Euro tester for rip-off fabrics
Later, spies used invisible inks made with special chemicals.
Spies have been sending messages in invisible ink for ages.
Gadget gallery
It appears that owners of certain HP Indigo six-color presses (1000, s2000 and ws2000 models) can now buy invisible inks as part of the company's security package.
Invisible ink reveals new uses for Indigo presses
In George Washington's day, spies relied on secret signals and invisible inks that would probably amuse 21st century children.
Hidden Secrets: a Complete History of Espionage and the Technology Used to Support it
They study invisible inks and other methods of keeping messages secret.
Secret codes

Dictionary browser ?
Full browser ?