What will happen to my gray roots if I use blue shampoo?

Blue shampoo will not have much effect on your gray roots except to perhaps make them look a little brighter against your dyed ends. If you overuse blue shampoo, however, your gray roots might take on a bluish tint.

What effect does blue shampoo have on brassy red tones?

Blue shampoo reduces the appearance of brassy orange tones. It won't help neutralize brassy red tones; for that, you'll need a green shampoo as green is the opposite of red on the color wheel.

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