Will Ghusl be valid if the Hair is Dyed in Fashionable Colours?

Q: Taharaat-60: The boys and girls here dye their hair in fashionable colours. Is their wudhu and Ghusl valid? Is it correct to base the ruling on that of dying with henna?

Answer: If the dye is thin (permeable) like henna, the wudhu and Ghusl will be valid, but this fashion needs to be forsaken. And Allaah knows best what is most correct.

Fatawa Rahimiyyah vol.2