So if you have blonde highlights or you lighten your hair to an all-over blonde, you may notice the lightened hair may become dingy and yellowish over time as repeated shampooing, the sun and thermal tools all strip away the cool tone and expose the underlying warmth. If you are brunette and you have highlights or have lightened your allover hair color, you may notice that over time, your hair begins to look brassy. For our lab test, we used a spectrophotometer. It's a colour measurement device that we used to analyse the improvements in the yellow tones of the hair after a one-week testing period. Find out which is the best anti-brass shampoo below... Matrix pros like to recommend a full system that will not only tone brassy brunette hair color but will also strengthen and condition the hair. Their system of choice is Matrix Total Results Brass Off. The system contains: Hairstyling pros recommend sudsing up with blue shampoo once a week to cancel orange or red tones out of brown hair color. For more toning, leave it in your hair for two or three minutes before rinsing. Don’t worry if your blue shampoo hits the shower tile--it will rinse out. You may wish to use gloves when shampooing to protect your skin. What’s a Good Blue Shampoo to Use? It’s very common for colour treated hair to change tone, especially through exposure to the sun, environmental pollutants and water with high mineral levels or chlorine,' says Gina. 'When hair is lightened, the natural colour is removed to accommodate the new colour, but as all hair colour has an underlying warmth, this will eventually start to show through. Using a purple shampoo will balance the yellow and orange tones in the hair.' How many times do you use purple shampoo?

Brass Off Custom Neutralization Mask, for hair that needs a conditioning and toning upgrade. This highly pigmented blue-violet formula neutralizes and eliminates brassy/orange tones to maintain lightened hair. It also helps repair and protect fragile hair.Every hair color has underlying warm tones that are exposed when hair is lightened with hair color or bleach. Lighter hair color has underlying yellow tones when lifted. Darker hair color has underlying orange tones. We spoke to Gina Conway from Gina Conway Salons and Spas, who helped shed some light on why hair goes brassy and how a purple shampoo can help: