secret ink

noun

Definition of secret ink

: 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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Learn More About secret ink

Dictionary Entries Near secret ink

secretin

secret ink

secretion

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Cite this Entry

“Secret ink.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/secret%20ink. Accessed 29 Nov. 2021.

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