Sal Ammoniac is a rare mineral composed of ammonium chloride. It is used as an ingredient in potion-making; three drachms of pulverised Sal Ammoniac are required in order to brew the complex Polyjuice Potion. According to an alchemical work dating back to the 1550s, Sal Ammoniac is used in the making of the perfect medicine, along with salt, urine, vinegar and a particular Sulphur Vive.
- Harry Potter and the Philosopher's Stone (film) (First mentioned)
- Harry Potter and the Chamber of Secrets (film) (Mentioned only)
- The Road to Hogwarts Sweepstakes