Is it permissible for a woman to put dyes on her head that prevent water from reaching it and wipe over them?

Question:
He says: Honorable Shaykh, may Allah grant you success, some women put dyes on their heads that prevent water from reaching the hair, so what is the ruling on wiping over them in wudu'?

Answer:
No, if the dyes harden and solidify on the hair so that water does not reach it, they must be removed, and the wudu' is not valid, and wiping over them is not sufficient. But if the dyes do not harden on the hair and do not prevent water from reaching the hair, there is nothing wrong with it. Yes.