Black Magic is Not a Myth in Articles by Aleister Crowley.

“There is an altar, but the candles are of black wax. The crucifix is fixed the head downwards.” [via, also]

Consider also:

  1. “The ‘Black Mass’ is a totally different matter. I could not celebrate it if I wanted to, for I am not a consecrated priest of the Christian Church. The celebrant must be a priest, for the whole idea of the practice is to profane the Sacrament of the Eucharist. Therefore you must believe in the truth of the cult and the efficacy of its ritual.”
  2. “A renegade priest gathers about him a congregation of sensation-hunters and religious fanatics; then only can the ceremonies of profanation be of extended black magical effect.”
  3. “Foolish people say that I am a Black Magician, that I am in the habit of celebrating the Black Mass and the Witches’ Sabbath, that I eat new-born babes and explore the sky on a broomstick. They say that Satan is my master and that I am his faithful agent.”
  4. “I was made to kneel before an altar and repeat a formidable oath of fidelity, of secrecy, and of abstinence from any kind of conduct which might impair my power of self-control.”
  5. “I constructed a private temple in a flat in Chancery Lane. It was a hall of mirrors, the function of which was to concentrate the invoked forces. It contained an altar of acacia topped with gold and certain secret symbols and regalia of the Order.”