When you color your hair brown or blonde, you might not like the warmth that comes through your hair color. Going for a cool-toned look, it’s important to have an at-home care routine that will help you neutralize brassy tones and keep your color free of unwanted orange shades.

Recommended Video If this sounds like something you struggle with, find out more about what a blue shampoo is and how to use it properly to avoid having a green hair mishap.

What Does Blue Shampoo Do?

Blue shampoo is a toning shampoo that contains blue pigments. The latter deposit onto the hair with each wash, neutralizing any warm underlying pigments. If you have red or orange tones in your hair, blue toner will not give you a blue tint: because blue and orange are opposites on the color wheel, blue pigments will do corrective coloring, neutralizing orange and keeping your hair color cool.

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Who Should Use Blue Shampoo?

Blue shampoo should be used on lightened and highlighted brown hair and is ideal for anyone trying to maintain a perfect caramel, dirty blonde, and ash brown color. It can also be used on natural brunettes but the effect might not be as drastic.

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Here is a color science behind it. Each hair color has a variety of underlying warm pigments that always come through when the hair is being lightened to a new hair level. Medium to light shades of brown hair naturally contain warm undertones such as red and orange, and they almost always come through when going through a color process. In this case, you will most likely benefit from a blue shampoo that will help you reach or maintain the desired brunette hair color.

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For highlighted and blonde hair, the results of using a blue pigment may be different and, potentially, less appealing. It is not recommended for golden or yellow-based blondes because blue shampoo can add a green tint to the hair. Remember, when yellow and blue mix, it creates a green color – a hair color mistake that is very difficult to correct. Thus, when your hair is highlighted to yellow, you should be very careful with blue toners and blue shampoos.