From Latin: apparere= to appear

This charm reveals secret messages which are written in invisible ink or any other hidden markings. It also works against Concealing charms.

Hermione Granger uses this charm in "Harry Potter and the Chamber of Secrets" to try to reveal any hidden message in the diary.

Hi, my witches, wizards and muggles, that was the chapter for today!
I hope you liked it and we'll read us again next week!