invisible ink

Etymology
+

Noun

 * 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.
 * 1) An ink used in pranks that is visible at first but soon disappears.

Translations

 * French: encre sympathique
 * German:
 * Polish:
 * Romanian:


 * German: Scherztinte