Yellow candles are suitable for any ritual that involves the Mind. Intelligence, memory, concentration, creativity, and more can be enhanced by burning yellow candles. If you are seeking wisdom and clarity, they are an excellent option.
When you need to provoke action or movement, yellow candles can aid you in your efforts. They inject energy into the balance, so you can "get the ball rolling", so to speak.
Burning yellow candles creates a cheerful environment, and opens you to joy and optimism. If you are fighting the doldrums, and need a positive new outlook on Life, try incorporating them into your magical activities.
Yellow candles can be used to represent the Sun on your altar, and the element of Air.
How should I charge my candles? When you are ready to use your candle, before you light it, take a moment to simply hold it in your hands and focus on your objective. In addition to the general intention, think about your situation in particular, and the change that you would like to create. Some people choose to anoint their candles with oil at this time, or carve symbols into the wax. That's entirely up to you.
Why should I trim my candle wick? The length of a candle's wick determines how much fuel (the melted wax) is feeding the flame. If the wick is left too long, the candle burns more quickly than it should. It also produces more soot as it burns, which can leave a residue on the walls and ceiling. If the wick is too short, the candle will not stay lit. The ideal length is between 1/8-1/4".