Avoid colouring your extensions even if this is 100% Remy Human Hair because the hair is already coloured with professional chemical treatment. But if you still opt to colour your extensions, we recommend only colouring them darker. Please do not try to bleach as this will cause damage to the hair. When you touch up your colour, just touch up the root area. Avoid also tinting, perming or any other chemical processes as it will weaken the hair.