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Synthetic colour molecules are very small, which allows them to penetrate cuticle. Once inside, an oxidation reaction takes place between the ammonia and the hydrogen peroxide causing the dye molecule to swell and become trapped and unable to escape the cuticle. Think of it as an ‘Alice in Wonderland’ effect, where Alice is unable to get back through the door she came through due to growing so large.
Zalon reverses the oxidation process by shrinking the synthetic colour molecules, allowing them to escape from the cuticle and be washed away. This reveals the lightest previous natural shade of pigment.
The colour shown may be lighter than the natural virgin hair colour, as the bleach and ammonia from previous colourants may have lightened the natural pigment (as mentioned above).