- " [...] which means, of course, that assuming we have achieved correct identification of the potion's ingredients by Scarpin's Revelaspell, our primary aim is not the relatively simple one of selecting antidotes to those ingredients in and of themselves, but to find that added component which will, by an almost alchemical process, transform these disparate elements -"
- — Horace Slughorn[src]
Professor Horace Slughorn instructed his sixth year potions class to use this spell, although most of them were absolutely clueless. The only one who truly knew what to do was Hermione Granger, who was casting the spell nonverbally but doing the antidote extremely slowly anyway and not finishing on time.
- Harry Potter and the Half-Blood Prince (First appearance)
Notes and references
- Harry Potter and the Half-Blood Prince, Chapter 18 (Birthday Surprises)