The ruling on a woman changing the color of her hair to black or to a color other than black?

Question:
Umm Anas says in her letter: I applied a substance to my hair to make it smooth, but it turns the hair yellow. Have I committed a sin in doing so, and have I fallen under the prohibition in the hadith of the Messenger of Allah (peace and blessings be upon him): "Change this white hair and do not follow it"? But there is nothing in my hair, and there is no harm in it; because I am married. And if there is a sin in it, what is required of me? And if there is white hair in the hair, even though the intention is to smooth the hair and not to seek blackness, what is the ruling in that case? May Allah reward you with good.

Answer:
White hair is changed; it is recommended to change white hair, but with something other than black. It is changed with a color other than black, due to the prohibition of the Prophet (peace and blessings be upon him) against changing white hair to black. As for hair that is not white, it remains in its original color, unless it is disfiguring, in which case it is treated with what removes its disfigurement. If it is ordinary and not disfiguring, it is better that it remains in its form. If it is changed with one of the colors and it is not a serious matter, that does not reach the level of prohibition, because the prohibition was not reported except regarding changing white hair to black.