invisible ink

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English

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English Wikipedia has an article on:
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Etymology

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invisible + ink

Noun

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invisible ink (countable and uncountable, plural invisible inks)

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

Translations

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