Meaning of “invisible ink” in the English Dictionary

british dictionary

"invisible ink" in British English

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invisible inknoun [ U ]

uk /ɪnˌvɪz.ɪ.bəl ˈɪŋk/ us /ɪnˌvɪz.ɪ.bəl ˈɪŋk/

ink that cannot be seen until it is treated with chemicals or heat:

It's a secret message written in invisible ink.

(Definition of “invisible ink” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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