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When colouring the hair to the identical or to a darker shade new synthetic pigment molecules are added to the hair’s pure pigment altering its color. Whereas in lightening the hair’s pure colour the darker natural pigments want first to be damaged down then changed with the new synthetic pigments.
Ammonia an alkaline compound with oxygen and hydrogen lifts and opens the hair cuticles permitting the small dye molecule to penetrate the internal cortex. Because the dye molecule is oxidised by the hydrogen peroxide the orange hair clips ammonia that gives the alkaline setting acts as a catalytic agent bonding and breaking down the hairs natural colour pigment. The assorted combos of pigment color mixture of the first colours present the final shade chosen. Hence orange hair clips when ColourB4 is used to take away the synthetic pigment the hair doesn’t return to the unique pigment because it was eliminated due the lightening process.
Dye pigment molecules in permanent colour are very small and are designed to simply penetrate deep into the hair’s cortex. However naturally these molecules would merely fall again out of the hair throughout shampooing. With a view to trap the dye molecules in the cortex the dye uses ammonia blended with hydrogen peroxide.