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invisible ink

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noun
  1. sympathetic ink.
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Origin of invisible ink

First recorded in 1675–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for invisible ink

invisible ink

noun
  1. a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc
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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