Magickal Form: Residue from something that is burned
The religious and magickal uses of ash include weather magic, healing, divination, acknowledgment of mortality and immortality, resurrection, mourning, purification, repentance, sorrow, protection, the conquering of fear, remembrance, fertility, and luck. Ash also represents the intellect, memory, new clarity and vision.
The best known spiritual rite using ash is the burning of the sacred palm to obtain ashes to mark the forehead on Ash Wednesday. Witches burn paper or herbal talismans to unlock their energy and work with the ash to bring about magickal transformation.
Source: Encyclopedia of Magickal Ingredients