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Yes. Every time.
We always recommend doing a skin allergy test before Colouring and follow the instructions.
Each Colour Developer has a different Lightening value or strength, to suit every individual Hair Colour. Its simple, the first number on the Developer represents the level it will lift your Natural Hair Colour. For Example:
Or if you refer to Developer as Peroxide the levels are:
No, the Colour Recommendation System is just a guide.