What do candle colours mean in candle magic?

Short answer: In candle magic tradition white is for cleansing and all-purpose work, black for protection and banishing, red for passion and courage, pink for love and friendship, green for money and growth, gold or yellow for success and confidence, blue for calm and communication, and purple for intuition and spirituality.

Colours at a glance

White: purity, cleansing, a stand-in for any colour
Black: protection, ending, absorbing negativity
Red: passion, courage, energy
Pink: love, friendship, self-care
Orange: creativity, enthusiasm
Yellow: confidence, study, cheer
Gold: success, abundance, the sun
Green: money, luck, growth, the garden
Blue: calm, honesty, communication
Purple: intuition, wisdom, spiritual focus
Silver: the moon, dreams
Brown: home, animals, the earth

Using spell candles

Small 'chime' or spell candles burn in one to two hours, so many people let them burn down in one sitting while focusing on an intention. You can carve a word into the wax or dress the candle with a drop of oil (keep oil away from the wick). These are traditional and spiritual associations shared for interest, not health or medical claims.

Safety

Use a proper holder; spell candles are thin and can tip.
Keep away from curtains, shelves and pets.
Never leave a candle burning unattended — snuff it and relight later if you need to go out.