|"Are you a wizard or not?"
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Black flames were a type of enchanted fire used in the sixth obstacle of the defences surrounding the Philosopher's Stone during the 1991–1992 school year. After entering the chamber, purple flames sealed off the entrance, while black flames blocked the exit. Only by solving Severus Snape's potions riddle could one leave the room. The bottle on the far left contained a potion that allowed the drinker to pass unharmed through the flames and proceed to the final chamber where the Philosopher's Stone was kept.