The ruling on dyeing white hair black out of need

Question:
A questioner asks: If a person’s hair turns white due to illness or from using salt, and this young man is young, but because of the illness his hair has turned white, is it permissible for him to dye this hair black, or is it not permissible?

Answer:
He should not dye it with pure black, but he may dye it with henna or with a black that is not pure, such as khamrah or a black that is not pure, a black that leans toward red. There is no harm in that. As for pure black, it is not permissible. The Messenger of Allah (peace and blessings be upon him) said: “Change this white hair and keep away from pure black.” Yes.