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
Dictionary Entries Near secret ink
Cite this Entry
“Secret ink.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/secret%20ink. Accessed 26 Nov. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share