A skin test is used to identify?, metallic salts, allergies, Failure to test could lead to:, hair and scalp damage, imprisonment, Test results can influence the colouring and lightening service by affecting the:, choice of product and service offered, Depth and tone, What action should be taken if the client`s hair shows poor elasticity, Offer alternative service and record information, recommend highlights, The principles of colour selection are to analyse:, depth, tone, percentage of grey and target shade, porosity of the hair structure, Why is it important to use protective equipment? to:, To keep you uniform clean and dust free, To avoid contact with potentially hazardous substances, How do the different peroxide strengths affect the colouring and lightening process?, The higher the percentage the darker the end result, The higher the percentage, the lighter the effect, You would need to pre-soften the hair when it is:, coloured, resistant, What is the pH value of a semi-permanent colour, 6.8, 4.5, Are permanent colours acid or alkaline, Acid, Alkaline, It is important to restore pH balance after a colour to:, Stop creeping oxidation, to smooth out the cuticles

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