What is the ruling on a girl, who does not suffer from gray hair, dyeing her hair with chemical or natural substances, for the purpose of adornment for her husband?

There is no objection to a woman using coloring agents to adorn her hair for her husband, provided that it does not contain black, due to the Hadith: "Change this, but avoid black," and that it does not harm its user, and that it does not involve imitation of disbelieving women, and that it does not contain any impure substances.