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What is a permanent hair dye?
Permanent or oxidative hair dyes change the colour of the hair permanently in one application and also cover grey hair.
What are the main characteristics of an oxidative hair dye?
Oxidation dyes or permanent dyes are characterised by their durability, total coverage of grey hair and their simple and safe application. They are the most commonly used dyes by professionals.
How do permanent dyes work?
The cosmetic active ingredients penetrate the cortex through the scales of the cuticles and need an oxidant and an alkali for the chemical reactions to take place that will give rise to the colour.
How long does a permanent dye last?
Permanent dyes do not wash out and, as the name suggests, remain in the hair. You only need to reapply dye to the roots as your hair grows.