Invisible Ink

Invisible Ink was a type of ink that transfigures anything written in it to become invisible. Text written in invisible ink can be rendered visible again in two ways, either by using a Revealer or the spell Aparecium.

Hermione Granger thought the contents of Tom Riddle's diary might be written in invisible ink and tried "Aparecium" to reveal them, but it had no effect.

Behind the scenes

 * Invisible ink may actually Vanish the text written in it.

Appearances

 * Harry Potter and the Chamber of Secrets
 * Harry Potter: Trading Card Game