invisible ink


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invisible ink

n.
Ink that is colorless and invisible until treated by a chemical, heat, or special light. Also called sympathetic ink.

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

invis′ible ink′


n.
a writing fluid that is invisible until treated, as by heat or chemicals.
[1675–85]
Translations
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.
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.
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.
Based in Santa Barbara, CA, Transitions Digital Graphics is a leader in the development of changeable advertising signage and displays that utilize invisible ink.
From ancient Egyptian hieroglyphics, through invisible ink and many ingenious formulaic codes, to code cracking, verbal codes, Morse code and mathematically based computing devices, this rich and varied field of activity is covered with enthusiasm.
029 2063 6464 THEATRE The Terrible Things I've Done Invisible Ink has been collecting true stories of the terrible things we do.
The contract has as its object the supply of invisible ink type U.
conversation with silence tapped out like an invisible ink, held to
Virtually all the lecturers, including Powell, spoke under the opacity of an invisible ink carrying this subtext.
To see what you have written, you must use a "developer," which will cause the invisible ink to turn a dark color.
Young visitors can enjoy easy experiments in a special science lab where they will discover fascinating facts, explore workings and learn such delights as how to make baking soda "volcanoes" and secrets behind floating eggs and invisible ink letters.