Pre-lightening - To lighten up the hair prior to service , Pre-softening - To open the cuticle prior to colouring , Pre-pigmentation - To add colour molecules into the cortex , How to remove hair colour - With artificial colour removers , Why must we carry out elasticity tests - To see if the hair can with stain a chemical service , Why must we re-turn the PH balance to its natural state - To close the cuticle and stop the process , 9% Hydrogen peroxide will - lift up to 3 shades , Temporary colour cant  - cover grey hair , Semi permanent colour will  - not cover grey hair , Semi permanent colour will - can be used to Pre-pigmentation , Post colour treatments  - can be used to even out the porosity , acid  - 0-6,9, alkaline - 7.1-14, Hair ph - 4.5-5.5, Neutral  - 7, 6% - darken, lighten 1 shade, tone, covers white  , 12% - 12% – lightens 4 shades with tint, 4-5, Quasi- - permanent colour – covers up to 70% white hair, Scalp irritation - remove immediately, 12 % Hydrogen Peroxide - shades with high lift tint, lightens up to 7shades with bleaching products, How to neutralise Green tones - use warm/red shades if condition allows, How to neutralise orange  - neutralise with blue ash., How to neutralise red - re-bleach use green matt/olive tone., Colour correction techniques - Lighten,darken, add tone, remove colour, neutralise,

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