EN

Synonyms for invisible ink

  • noun

Most common

secret ink

All synonyms

Noun

1. Secret ink — an ink, invisible on application or soon thereafter, that can later be rendered visible by some process, such…

secret ink, sympathetic ink dated

Definitions

  1. n. 1

    An ink, invisible on application or soon thereafter, that can later be rendered visible by some process, such as exposing it to heat.