Invisible ink, also known as security ink, is a substance used for writing, which is invisible either on application or soon thereafter, and which later on can be made visible by some means. Invisible ink is one form of steganography, and it has been used in espionage. Other uses include anti-counterfeiting, property marking, hand stamping for readmission, fun children's games, and marking for the purpose of identification in manufacturing.
Read more about Invisible Ink: Application and Use, Properties of An "ideal" Invisible Ink, Screening Letters For Secret Messages, Invisible Ink Types, Modern Relevance of Invisible Ink Messages, Digital Invisible Ink
Famous quotes containing the words invisible and/or ink:
“the quicksilver art
Throws back the invisible but lightning mass
To inhabit the room; for I have seen it part
The palpable air....”
—Allen Tate (1899–1979)
“Paper is soft and ink is fluid; it might be better if some pages of this chronicle could be written on chips of granite at the point of steel.”
—E. M. Almedingen (b. 1898–?)