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? As with all hair products, there are an overwhelming number of purple shampoos on the market, making it hard to determine which one's right for you. Thus, I asked Ellis to break down the basics. How often you use it depends on the level of toning needed and health of your hair," says Mondo. He explains that the shampoo can be used as a regular shampoo, or it can be left on for longer if you want a stronger toner effect. First, determine how much toning your blonde hair needs and go from there. The best way to use a purple shampoo is on wet hair. Simply lather it up and leave on for about two to four minutes, depending on the amount of colour-correcting needed. Mondo warns that because purple shampoo deposits pigment onto the hair, if you use it too often, or keep it on too long, your hair can turn a little too purple, especially if it's particularly dry or damaged. To avoid this, he recommends using the product until the desired level of tone is achieved, and then "weekly, or every other week, for maintenance." What should you use after purple shampoo?

The effect is softer, both in terms of the colour and how my hair feels afterwards. I wouldn’t recommend taking your purple shampoo right down to the ends. The hair there can be up to four years old so will grab onto too much of the purple pigment. Purple shampoo is great for anyone with light hair (natural or salon-treated). So if your hair is blonde, platinum, very light blonde, grey or bleached with cool pastel colours, purple shampoo is for you. It won't work on brunettes, but if you're a brunette with blonde highlights, you can use purple shampoo to keep your highlights looking fresh. What purple shampoo should I get? If you’re adding a purple shampoo to your regimen, start by using it once a week and only build up if needed. Remember that while purple shampoo is a beneficial tool in keeping color fresh, it’s important not to go overboard. “If you start to notice too much or an overload of purple tone in your hair, put the purple shampoo down,” he says. “Opt for a clarifying shampoo to remove the tone and keep your purple shampoo routine to once a week or less. Alternate using it with color-safe shampoos—or mix them together for less violet deposit.” How do you choose the right purple shampoo formula for your hair?Ro Morgan is a New York-based hairstylist who specializes in natural hair, wigs, and hair extensions. Morgan works with celebrity clientele such as Naomi Campbell, LionBabe, Precious Lee, and more. NBD, right?!

What Katie says: "This is the product I never knew I needed. The Olaplex system is the ultimate product range for protecting and caring for bleached hair. So the idea of a toning shampoo with the Olaplex technology inside is mind-blowingly exciting. It has become a must-have for me, as I use it alongside the rest of the range. I particularly like to use it straight after I've had my colour done when my hair is at its most vulnerable. If you're looking for a product that you can 100% rely on, this is that product." But Zoe Irwin, creative director at John Frieda Salons, advises clients to be careful as purple-based products can be drying. To keep hair looking its blonde best between salon visits, minimise washing and rinsing it to avoid dumping your toner straight down the drain. Also try washing in cooler water to avoid stripping colour out of dyed hair. When not washing with purple shampoo, be sure to use a shampoo for colour-treated hair as this will protect the colour molecules intact. So when you wash with this particular shade of shampoo, it deposits purple pigment into blonde hair, to counteract any yellowy tones that start to shine through. What causes brassy hair?

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When it comes to hair, there’s nothing better than fresh color. The challenge? Maintaining that just-left-the-salon level luster until your next dye job. Blondes in particular may notice signs of brassiness over time. This yellow or orange cast can be caused by a number of things, including "your color oxidizing over time, exposure to UV light, chlorine and even traces of copper in your water,” explains Meri Kate O’Connor, celebrity colorist at Loft 647 in West Hollywood, California. This is where a purple toning shampoo can help. What is purple shampoo good for and what happens when you use it? If you can’t avoid it, coat the ends in conditioner first to create a hydrating base and to dilute the shampoo. Then apply your purple shampoo in an 's' shape on mid-lengths and work it in with your fingers to deposit the pigment evenly." For how long should you leave purple shampoo in?

And fun fact: Purple shampoo works on a variety of light colors, including classic blonde, as well as balayaged and highlighted hair, and even gray, silver, and white shades, says Mondo. Is it OK to use purple shampoo every day?As well as purple shampoos and conditioners, blonde hair will benefit from a monthly treatment masque or glossing treatment, to help add shine as well as freshening up colour. What Sunil says: "A full believer in the restorative and transformative powers of Olaplex, after having recently gone blonde, I was thrilled when they launched this product. It doesn't leave my hair feeling dry - my hair ACTUALLY feels better after using - and the colour payoff is seriously impressive." This porousness means bleached hair soaks up unwanted minerals and metals in your tap water and acquires a yellow tinge over time. "It also means that blonde hair absorbs light instead of reflecting it and is more prone to damage," adds Shiel. How to use purple shampoo This shampoo is marketed for people with blonde, gray, and highlighted hair, and boasts a strong color-depositing formula. Indeed, multiple reviewers write about how impressed they are with it, saying that they noticed a marked improvement in their hair color after just one wash. Because it’s so highly pigmented, the brand recommends using gloves when applying this shampoo to wet hair before lathering well and rinsing as thoroughly as possible. If you find that your hair is in even more need of anti-brassy TLC, repeat the process and leave the formula on for three to five minutes before rinsing.