A Simple Guide to 4N Hair Color? If you want to conceal grays or add subtle depth, 4N hair color is a gentle, neutral dark brown that offers you a natural look. You won't get brassy or ashy tones since 4N maintains its balance, unlike some colors that pull excessively warm or cold. It's a deep, rich brown that complements almost everyone. We'll cover all you need to know in this guide,…