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Invisible ink
Meaning
Noun
●
An
ink
,
invisible
on
application
or
soon
thereafter, that can
later
be
rendered
visible
by some process, such as
exposing
it to heat.
●
An
ink
used in
pranks
that is
visible
at first
but
soon
disappears.
Sourced from
Wiktionary
Synonyms
Sympathetic Ink
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