A black candle is a Firemaking item which is used during Merlin's Crystal. It can be lit with a tinderbox to create a lit black candle. The black candle can be obtained by trading a bucket of wax with the CatherbyCandle-maker or simply purchasing it from his store. The bucket of wax is obtained from one of the beehives west of Catherby by spraying the beehive with insect repellent and using a bucket on it. This item cannot be substituted with a standard white candle for Construction in a Player-Owned House.
Black candles are considered to be unlucky by the candle maker.
After the quest it is possible to buy black candles from the candle maker for 3 coins each, as he claims that the player "started a trend" with the black candles, and has begun selling them, despite being considered unlucky.