Gray or white hair lacks pigment; therefore, foreign materials such as minerals in tap water, chlorine in swimming pools, smoke and air pollutants build up and cause a yellowish tinge to your hair. Unfortunately, nothing will prevent this from occurring, but after it's happened, you can use a variety of chemical methods to remove the yellow from your white hair, including permanent dye, semi-permanent dye or a blue hair rinse. But the easiest and most natural way to remove and keep the brassy yellow tones out of your hair is to use a blue shampoo, which is safe, and no patch test is required. Find it at your grocery or beauty supply store.
Thoroughly and evenly wet your hair. Apply the blue shampoo evenly throughout your hair, working it into a thick lather.
Rinse out the blue shampoo, and repeat the application, again bringing the shampoo to a thick lather. Leave the shampoo in your hair for 3 to 5 minutes.
Rinse the blue shampoo from your hair. You will have removed the yellow tone, which leaves your hair a bright white. Towel-dry your hair. Blow-dry and style your hair as usual.
Use a blue shampoo once a week to keep the brassy tones from your white hair. Use blue shampoo on light blonde hair to remove brassy tones. Do not get blue shampoo on your clothing, as it will stain the clothing, but it will not stain your skin.
Do not leave the blue shampoo in your hair too long as it can cause your hair to take on a bluish tinge.