Brilliant Knockturn Alley
Tallow and Hemp Toxic Tapers, Knockturn Alley
Poisonous candles are rather insidious devices. Functionally speaking, they work the same as a regular candle, the only difference being that they emit toxic fumes when burned. The Ministry considers poisonous candles (like many items for sale in Knockturn Alley) to be dangerous and warns against purchasing them for obvious reasons.