|Muggles' Guide to Harry Potter - Magic
|Reveals Hidden Ink
|Harry Potter and the Chamber of Secrets
Specialis Revelio is a charm used to reveal hidden ink.
Extended Description edit
In Harry Potter and the Chamber of Secrets, Hermione Granger uses it as an attempt to reveal any hidden ink in Tom Riddle's diary.
It seems as if the first word of the spell, Specialis, does not need to be stated for the spell to be used.