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Ronald Weasley: "That's a brilliant theory, Hermione. With just one tiny little flaw. There's nothing written in his diary."
Hermione Granger: "It might be invisible ink! Aparecium!"
Hermione Granger and Ronald Weasley discuss Tom Riddle's diary[src]

Invisible Ink was a type of magical ink that transfigured[2] 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.[1]


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.[1]

Behind the scenes

  • Invisible ink may actually vanish the text written in it.


Notes and references

  1. 1.0 1.1 1.2 Harry Potter and the Chamber of Secrets, Chapter 13 (The Very Secret Diary)
  2. Harry Potter Trading Card Game - on its debut card, invisible ink appears as a transfiguration