It depends upon specifics. In Islam, it is permissible to dye hair with modern dyes and other substances, provided certain conditions are met. These conditions include:

1. The dye should not be black if used to cover grey hair, as this is considered haram.
2. The dyeing should not involve imitation of non-Muslim or immoral women.
3. The ingredients used in the dye must be halal.
4. The dye should not be proven to be medically harmful.

Therefore, changing hair color to anything other than black is generally permissible, unless done in a manner resembling non-Muslim or immoral women.

And Allah knows best.

Sources:

1. Is it haram to dye your hair?
2. Using hair dye
3. Is dying hair prohibited in Islam?