red, blue, yellow - primary colours , orange, green, violet - secondary colours, tone - warm, cool or neutral seen in the hair, depth - lightness or darkness, melanin - natural colour pigment in the hair, black/brown  - Eumelanin, red/yellow - Pheomelanin, cortex - where the colour pigment is found, skin test - to check for allergic reaction , incompatibility test - test for metallic salts, colour test - to determine the potential colour result, porosity test - to check if the cuticle is raised or closed, elasticity test - to test if the hair will stretch and spring back, strand test - to monitor the colour development & condition, contra-indications - may stop or alter the service,

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