Hi Dream Angel
In witchcraft the colour of candles is very significant and they each have their own properties.
White can be used for anything.
When a witch casts her/his circle a yellow candle is used for the East - the Guardian Spirit of Air, Red for the South - the Guardian Spirit of Fire, etc.
Some witches associate the colour of the candles with chakras too.
A witch might use a black candle to absorb or banish - e.g. if there was some negative emotions, it could be written down and burnt in the flame of a black candle and the energy released into the universe.
Here's a link to what coloured candles represent in the craft if you fancy checking it out:
http://www.witchcraftcalling.co.uk/w...urcandles.html
Blessings, Amethyst x