This is a daft and superficial question and I have read the nhs guidelines which basically say yeah go ahead but be careful but don't mention bleach...!
I dip dye my hair (blonde on the ends nothing on the roots sounds rank i know but i like it). this means when I cut my hair quite a lot of my colour comes our if don't recolour....is it safe to use peroxide based colours? it is only on the ends so none on my scalp....