Going Dark Brown and Brunette
If you have a cool skin tone and like to go dark then your choices include also mahogany brown or brunette mahogany. The trick is to choose the right subtle of red (violet red for cool skin tones) in your brown shade. If you have doubt, either do it in a professional hair salon or choose a natural dark brown which is neutral and will match all skin tones.
If you are warm then choose medium brunette mixed with gold blond or go with dark brunette with red.