Go here if you are looking for the category Hair Levels. Go here if you are looking for the article Coloured Hair. Go here if you are looking for Hair Tones. Hair Depth or Hair Levels refers to “The International Hair Colour Level System” of 1 – 10, with 1 being the darkest (Black) and 10 being the lightest (Lightest Blonde) but occasionally 10+, 11 and 12 is used. These levels can determine how Hair Colouring will effect hair. Often the best results on colouring hair for bright colours and past
