Is salah permissible if a woman use hair colour or it is wrong? What should be done after use of hair colour? Please give me solution.
It is allowed to use colours other than black provided it does not contain impure things and it does not leave such a layer on the hair which prevents water from reaching the roots; otherwise wudhu shall not be valid and when wudhu is not right then salah shall also not be valid.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband