Ultimately, the end result might involve some deep, blue-based highlights if you already have nearly black hair to begin with. Or, if you have dark brown hair, a permanent blue-black color can be ...

That said, there are plenty of temporary options that will show up on your dark hair, like if you're going a shade or two darker or adding in a deep pop of color, like burgundy or midnight blue ...

Blue hair? For winter? It kind of is groundbreaking – and it’s not as scary as it sounds. Here’s what you need to know. When you think of blue hair, you probably have flashbacks to the super ...

Whether you have dark blonde or brown hair, here are our top picks for the best blue shampoos for brunettes, along with expert advice from Cotto to keep your color looking fresh from the salon.