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Brass is what you use to make a trumpet; it shouldn't be the color of your hair. When you have blond hair, the hair-dying process can make your hair fade or react with chemicals in your hair or shampoo that give it a red or faded tint -- called "brassiness" by those in the hair industry. Before you make an emergency run to your hairdresser's salon, use a color-correcting shampoo that’s tinged with a blue or purple tone to correct brassiness.
Dying your hair blond involves applying three colors of pigments: red, yellow and blue on your hair. The blue particles are the smallest, and they tend to leave your hair the fastest. That means that yellow and red are the remaining particles left on your hair, which equals brassy tones for you. That’s why blondes can use a blue- or purple-tinted shampoo: because it restores the lost pigments to your hair.
What to Look For
When buying a shampoo in the blue-toned family for your hair, look for one that has blue or violet colorants. Actress Blake Lively’s colorist Rona O’Connor said the actress uses Clairol Shimmer Lights Original Conditioning Shampoo to keep brassiness at bay, according to “Allure” magazine. In addition to the colorants, you also can look for a shampoo that has moisturizing ingredients, such as protein peptides, which can help to prevent more hair pigments from leaving your hair.
Watch Where You’re Rinsing
If a blue-depositing shampoo doesn’t seem to be doing the trick, make sure your shower water isn’t what’s causing the problems. Shower water that contains chlorine and iron can quickly make blond hair look brassy by fading your color. For your blue-toned shampoo to work, you may need to invest in a shower water filter that can remove these and other water impurities that affect your hair.
Don’t Be a Blue-Haired Lady
While blue-tinted shampoos can reduce brassiness, they aren’t for everyday use. That’s because using them too much can give your hair a blue tinge that’s probably not what you were going for either. Try using the shampoo once a week. If that doesn’t do the trick, increase the number of times you shampoo your hair with the blue-toned shampoo until you get it just right.