Azul Marino ink

Azul Marino ink was a type of ink that the Wizarding Examinations Authority's Magical Regulation 572 required fifth-year students at Hogwarts School of Witchcraft and Wizardry to use when sitting their O.W.L. exams.

The ink was presumably a deep blue colour (azul marino being the Spanish term for ultramarine).

Appearances

 * Harry Potter and the Order of the Phoenix (film)