invisible ink

American  

[in-viz-uh-buhl ingk] / ɪnˈvɪz ə bəl ˈɪŋk /

noun

1. a fluid for producing writing that is invisible until brought out by heat, chemicals, etc.

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invisible ink British  

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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Etymology

Origin of invisible ink

First recorded in 1675–85

Example Sentences

Now the memory of her was all but erased, as if it had been written in invisible ink.

From Literature

Whether the job was to jump on a stolen velocipede, win over a band of pirates, visibilize invisible ink, pen a sonnet, or don a disguise, Simon Harley-Dickinson was the man for it.

From Literature

Had he already known it was written in invisible ink?

From Literature

That’s the best invisible ink there is.

From Literature

“Indeed—and it was something so shocking that Pudge could only write about it in invisible ink, and was sworn to secrecy by the admiral, too.”

From Literature