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Pour the shampoo into a container, then add 25 to 30 drops of vegetable coloring and mix thoroughly until you get a uniform color.
Put the shampoo back in its bottle and use it normally, at least three times a week. Remember to leave it on your hair for at least 5 minutes before rinsing.
Now that you know how to make your own anti-yellowing shampoo for gray hair, you can enhance your platinum hair without having to constantly touch it up.