|Will not be used by monsters.
When lit, a magic candle gives a 3-tile radius of light tiles and burns indefinitely without melting - while it cannot normally appear as "partly used", the variable for whether a light source has been used at least once is still applied. This renders a magic candle unable to be sold if it was ever lit, and a "fresh" candle will stack separately from lit ones; it is unknown if a usage fee is incurred this way. A bug in wizard mode prevents any kind of magic candles from being sold.
Attaching a magic candle to the Candelabrum of Invocation will revert it to a mundane candle that burns for slightly longer.
The magic candle's light radius and high base price of 250 zorkmids makes it trivial to distinguish via price identification. As a permanent light source, magic candles are particularly useful for polearm and lance users (such as Yeomen and Knights) as well as jumping players. Unlike a magic lamp, it weighs much less and can be wished for, allowing you to freely rub those lamps for wishes - this also means less reliance on the Candelabrum for end-game jumping.
Attempting to relight a magic candle while carrying the non-full Candelabrum of Invocation will prompt you to attach the candle to the Candelabrum. To avoid having this prompt come up every time you are engulfed, it is advisable to immediately fill the Candelabrum with mundane candles, and to light it only for the Invocation ritual, snuffing it immediately thereafter.