invisible ink

English

Etymology

From invisible +‎ ink.

Noun

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.
    Synonyms: secret ink, sympathetic ink (dated)
  2. An ink used in pranks that is visible at first but soon disappears.

Translations

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