Hi, I am planning on doing some highlights at home, I usually go to the hairdresser and have 2 colours (dark ash and light ash) put though my hair using meche. I work near by to a hairdressing supplies shop so can get everything I need, I was just wondering what do I mix with the hair colour. I know that you by the colour in a tube and mix it with developer but are they different grades? Please help as I donít have a clue about mixing the colour.