Oxidation - The addition of oxygen , Reduction - The addition of hydrogen , Eumelanin - Cool toned, made of blue and green tones . Responsible for black/brown hair. Have large colour molecules., Phoemelanin - Warmer toned, made up of yellow and red tone. Responsible for yellow and red hair. Has smaller colour molecules, which are harder to remove., Underlying tone exposed on a level 5 - Red, Underlying tone exposed at a level 6 - Orange, Underlying tone exposed at a level 7 - Yellow/ Orange , Underlying tone exposed at a level 8 - Yellow, Underlying tone exposed at a level 9 - Pale yellow , Underlying tone exposed at level 10 - Very pale yellow , Depth - Identifies how light or dark the base colour could be, Tone - Refers to the warmth or coolness of a colour , Pre-Softening - Method used for resistant or white hair , Pre-pigmentation - Used on hair that has been lightened and you want to go back darker more than two shades,

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