Spell candles are different from your Quarter (Watch Tower) candles and Deity candles, because unlike these other candles, they need to be left to burn right down until they extinguish themselves. They also need to be solid colours, not just over-dipped white candles.
Selecting the right colour candle for the job, will add potency to your spell casting. So here's a few colours and their uses:-
WHITE - A combination of all colours, represents The Goddess, purity, peace, spiritual enlightenment, cleansing, healing, lunar energy and full moon magic.
GOLD - Represents the God, solar energy, happiness, fast money and happiness.
GREEN - Represents the element Earth, the cardinal compass point North, monetary and finances, abundance, success, fertility, growth, good luck, harmony and personal goals.
YELLOW - Represents the element Air, the compass direction East, learning, memory, creativity, concentration, solar energy and mental clarity.
RED - Represents the element Fire, the compass direction South, passion, energy, strength, courage, health, will power, lust and vigour.
BLUE - Represents the Element Water, the Compass direction West, good fortune, communication, wisdom, tranquillity, spiritual inspiration, healing, dreams and intuition.
PURPLE - Represents Transformation, spirituality, psychic ability, divination, ambition.
BROWN - Represents Earth magic, animal healing, concentration, friendship, grounding
PINK - Represents, friendship, affection, romance, love, emotional healing, peace, caring and healing others.
GREY - Represents problem solving, negative influence banishing.
BLACK - Represents Banishing, protection, negativity clearing, binding, uncrossing and New Moon magic.