Ammonia is the active ingredient in the colouring process that opens the cuticle so the colour can be absorbed into the strand and penetrate the hair cortex. This allows for intense colour changes. However, with their higher pH level, they can be damaging to the hair.

Ammonia-free colour is a lighter solution without the stimulant to open the hair cuticle. This means that rather than being absorbed, these colours are more likely to coat the strands. 

Use ammonia-free colour for a softer, less-damaging alternative.


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