Back in black!
If you notice that, despite repeated sharpening, your charcoal pencil still doesn’t paint a deep black, try holding the tip briefly in a flame and then blot with a towel: Lo and behold, your dark black has returned! The flame makes the surface of the charcoal more pliable and therefore easier to apply. Tip: Don’t make the tip too sharp—remember, the rounder the tip, the better the result!