# invisible ink

> English word · Noun

## Definitions
1. An ink, invisible on application or soon thereafter, that can later be rendered visible by some process, such as exposing it to heat.
2. An ink used in pranks that is visible at first but soon disappears.

## Etymology
From invisible + ink.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/invisible-ink