invisible ink

[ in-viz-uh-buhl ingk ]

  1. a fluid for producing writing that is invisible until brought out by heat, chemicals, etc.

Origin of invisible ink

First recorded in 1675–85

Words Nearby invisible ink Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use invisible ink in a sentence

  • Here for some reason the invisible ink answered less reluctantly to the warmth of the blue flames' invitation.

    The Messenger | Elizabeth Robins
  • Our censor chaps at home have got to be quite expert at reading letters, invisible ink and all that sort of thing.

    The Apartment Next Door | William Andrew Johnston
  • By writing in newspapers, sometimes with invisible ink or by enclosing accounts or letters in them.

    The History of the British Post Office | Joseph Clarence Hemmeon

British Dictionary definitions for invisible ink

invisible ink

  1. 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 & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012