secret ink
noun
: a fluid for invisible writing to be made visible afterwards: such as
a
: a colorless plant juice that can be made visible by subjecting to heat
b
: one of a pair of water solutions of chemicals that are colorless or nearly so and that when combined form a strongly colored compound
c
: a water solution of a fluorescent substance that is colorless in visible light but leaves characters on paper that fluoresce when exposed to ultraviolet light
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“Secret ink.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/secret%20ink. Accessed 1 Dec. 2024.
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