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Colourants & How They Work

An inside look at the science of haircolour

All permanent and nonpermanent haircolours are made up of two basic ingredients: a developer and colourants. But how do they actually work? Take a crash course on the colouring process and find out how L’Oréal formulas give you gorgeous, lasting colour.


The developer is an oxidizing agent. It activates the colourants and allows them to penetrate the hair cuticle, creating just the right tint. If you are lightening your hair, the developer activates the lighteners as well as the colourants.


The colourants are pigments that infuse your hair with colour. By reacting with the developer, the colourants are able to separate and coat your locks. All permanent and nonpermanent haircolours can darken and change your tone; however, only permanent colours can also lighten your natural colour.


All L’Oréal haircolours provide you with a deeply nourishing conditioner. These protect the hair from breakage and dullness. They also help seal in your colour to make it last. Conditioners are important to boost hair’s manageability while adding shine and bounce to your newly coloured strands.

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