ANSWER:

You can color your hair providing it is natural dye and it doesn’t form a layer on your hair but it should just give color after washing. 

Avoid black color as it’s prohibited and don’t apply weird colors like pink, or green etc.

Kindly refer to the following link(s):

I want to know can i color my hair and can use eye lenses for my mahrams only

Beautification & Cosmetic Suregry | February 20, 2018 4:33 pm
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Did the prophet muhammed ﷺ prohibit the combing of hair and beard everyday so we wouldn’t be obsessed with ourselves