One of the questions I'm asked most often is, "Why does having my hair coloured in a salon cost so much more than buying a box dye from the supermarket?" It's a fair question, and the answer goes far beyond simply applying colour. Cheap colour products and supermarket box dyes often use a "one-size-fits-all" approach. While they may seem like a money saver at first, they can lead to uneven colour, unwanted warmth, excessive dryness, colour build up and, in some cases, costly colour correction...