White: A balance of all colors; Spiritual enlightenment, cleansing, clairvoyance, healing, truth seeking; Rituals involving lunar energy' May be substituted for any color candle.
Yellow: Activity, Creativity, unity; brings power of concentration and imagination to a ritual; use in rituals where you wish to gain another's confidence or persuade someone, or in rituals that require solar energy.
Gold: Fosters understanding and attracts the powers of cosmic influences; beneficial in rituals intended to bring about fast luck or money, or in rituals needing solar energy.
Orange: Creativity, ability to speak one's mind, ambition, career matters and the Law, self-confidence. Solar color and also stands for Leo.
Pink: Promotes romance, friendship; standard color for rituals to draw affections; a color of femininity, honor, service, brings friendly, lively conversation to the dinner table.
Red: Health, passion, love, fertility, strength, courage, will power; increases magnetism in rituals; draws Aries and Scorpio energy.
Silver: Removes negativity and encourages stability; helps develop psychic abilities; attracts the influence of the Mother Goddess.
Purple: Power, success, idealism, psychic manifestations; ideals for rituals to secure ambitions, independence, financial rewards, or to make contact with the spiritual other world; increases Neptune energy.
Magenta: Combination of red and violet that oscillates on a high frequency; energizes rituals where immediate action and high levels of power or spiritual healing are required.
Brown: Earthly, balanced color; for rituals of materiel increase; eliminates indecisiveness; improves powers of concentration, study, telepathy; increases financial success; locates objects that have been lost.
Indigo: Color of inertia; stops situations or people; use in rituals that require a deep meditational state; or in rituals that demand Saturn energy.
Royal Blue: Promotes laughter and joviality; color or loyalty; use to attract Jupiter energy, or whenever an influence needs to be increased.
Light Blue: Spiritual color; helpful in devotional or inspirational meditations; brings peace and tranquillity to the home; radiates Aquarius energy; employ where a situation must be synthesized.
Blue: Primary spiritual color; for rituals to obtain wisdom, harmony, inner light, or peace; confers truth and guidance.
Emerald Green: Important component in Venusian rituals; attracts love, social delights, and fertility.
Dark Green: Color of ambition, greed, and jealousy; counteracts these influences in a ritual.
Green: Promotes prosperity, fertility, success; stimulates rituals for good luck, money, harmony, and rejuvenation.
Grey: Neutral color useful when pondering complex issues during meditation; in magic, this color often sparks confusion; it also negates or neutralizes a negative influence.
Black: Opens up the deeper levels of the unconscious; use in rituals to induce a deep meditational state, or to banish evil or negativity as in uncrossing rituals; attracts Saturn energy.
via College Wicca