Can I apply the NOAH colour after getting hennè or hair highlights?

First of all it is necessary to perform the sensitivity test 48 hours before each application. If you have done other colour treatment before, we are not able to ensure the success of the colouring because the final colour could be different to the one desired. Anyway, successive applications, spaced one month apart, will allow you to achieve the desired color. It is better to perform a test on a strand behind your neck to check the outcome of the color.