So, here we go.
First, about the different types of candles.
- Altar candles These are usually white or a black and white one and are placed on the altar and lighted before every ritual. The symbolic meaning is: A white candle for purification and protection. The white candle can replace any other color candle. The black candle is for going deeper into the depths of the mind. In the cases when a white and black altar candles are used, it's to represent the balance of the universe. Also, they represent the element of Fire in rituals.
Sacrificial candles. These are to represent a person or purpose when needed. They can be different color, they could have different scent, shape, depending on the purpose.
Archangel candles. These candles are used to ask the Archangels for help. Archangel Michael - a blue or gold candle to ask for mental or physical protection.
Archangel Raphael - a green or pink candle to ask for healing energy.
Archangel Gabriel - a dark blue candle to ask for guidance.
Archangel Uriel - a gold or purple candle to ask for calmness and courage.
Astral candles. These represent the person doing the ritual or the object of the ritual. Their color represents the star-sign. If you don't know the person's sign, you can use white candle.
Moon candles. They are usually shaped as crescent, but actually any candle with a crescent carved on it works. They are used to honor the Moon, to represent the Lady in a ritual and to represent the Moon phase.
Prayer candles. Usually seven day candles that help concentrate on your prayer.
Genital candles. Used in potency spells. The male candle has a phallus shape. The female candle is called "yoni candle" and has a vagina shape.
Skull candles. They are shaped as skull and are used in mind control spells. If green in color, they help people with mental problems.
Watch candles. These are burned for 3 days when someone passes away.
The information is from Richard Webster's book "Candle magic for beginners".
If you like the information, please feel free to add to it or correct me if you think something is wrong. Next, I'll post info on the colors and oils used in candle magick.