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Can you colour over henna hair colour? The 'henna hair colour' to 'synthetic hair colour' science: Henna essentially forms an impenetrable layer on the outside of the hair which is incompatible with synthetic hair colours (all the colours we use here at A Head Of Nature and most other salons come under this category). We never recommend colouring hair that has henna present as results are unpredictable and if there is a metallic compound present the reactions can be severe. If you have recently had a henna colour done it can increase the chance of an allergic reaction as Henna...

Frequently asked hairdressing questions with answers from qualified, experienced hairdressers and hair care professionals. Have a question? Comment below. Or call or email us today, we're happy to help!