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If you have already performed an allergy test with WECOLOUR hair dye in the same colour, it is not necessary to test again.
But if you are dyeing with WECOLOUR for the first time, or now decide to opt for another WECOLOUR hair colour, we recommend that you take an allergy test, because the ingredients differ per colour. The darker the colour, the more the risk of an allergic reaction.
Choose your colour through our hair colour advice tool and request a patch test with detailed instructions.