So, next time you're in the middle of a hair disaster, consider grabbing a purple shampoo before you start to panic. But remember that purple shampoo is meant to be a temporary fix until your next dye appointment—not a permanent panacea. First, you don't want to use a purple shampoo every day. Our experts suggest swapping one in for your regular shampoo once every few weeks, or when you want to brighten your shade or minimize brassiness or yellowing. As for how to use a purple shampoo, for best results, allow it to sit for three to five minutes before rinsing to fully penetrate the hair. If you’re a keen swimmer, use a hair protector to keep chlorine from stripping your hair colour and turning it yellow or even green, and rinse hair immediately after swimming. Blonde hair can turn yellow with time for two reasons. The first is salon-applied toner rinsing out over time to reveal a yellow undertone. The second is the hair shaft absorbing minerals and chemicals from the environment, which can cause yellowness. Chlorine from swimming pools and even sunlight can be major culprits for introducing yellow tones to blonde hair. This is particularly true of bleached hair, which is more porous. The violet tones in purple shampoo counteract any brassy tones in the hair, giving a more silvery finish that appears brighter and more vibrant.

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. We used the purple shampoo twice a week and found that it kept our honey blonde highlights looking creamy and cool – even two months post colour. It lathered well in the hair, smelt refreshing and didn’t feel drying once rinsed, although we’d still recommend following up with a nourishing conditioner to pamper our hair and seal the hair cuticle. Top tip: we massaged the foaming shampoo into our hair for two minutes to make sure each strand was properly coated.He advises using a shampoo with a violet or purple tint to keep gray hair color vibrant and fresh. "It doesn't need to be a daily wash, but using it once a week will cut brassiness and give you spectacular shine." Avoid using any shampoos that add warmth to gray hair, as cool-toned shampoos will help hair better reflect light. Since gray hair tends to be drier and prone to frizz, Dueñas also recommends avoiding harsh shampoos, as "it's important to leave as much moisture in the hair as possible." As with any shampoo, you want to look for a high-quality one that is sulfate free," he says. "A good rule of thumb is that the lighter it is, the more subtle of a tone it’s going to be. The brighter the purple, the more drastic the results will be." Unfortunately, the colour fading is an unavoidable evil, but purple shampoo is a great way to keep your blonde hair looking salon fresh for longer. It works by depositing violet tones that neutralise brass for brighter tresses without the need for bleach. Purple shampoo washes in and rinses out just like any other shampoo, making it suitable for use on all hair types and textures. 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?

Blonde hair goes brassy because bleaching or lifting does not remove all of the underlying golden/copper/red pigments in the hair when hair is lightened,” says Lynch. “These underlying pigments that remain after lightening are yellow, orange, and red in tone. As the cool pigments fade, the warm underlying pigments left behind after coloring become a larger part of the overall hair color. This warmer toned color is often described as having a brassy appearance.” 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.How do all the famous blonde bombshells in Hollywood keep their hair color looking so fresh? Chances are the best purple shampoos have a lot to do with it. They say that blondes have more fun, but we’re guessing that whoever coined that one isn’t referring to blondes who are dealing with their hair turning brassy shades of funky yellow or orange. When blondes have to spend a load at the salon on a toning treatment for their highlights, they definitely aren’t having more fun. The more you use purple shampoo, the more it makes your blonde look dull, because you are continuously depositing color shampoo," Kelly points out. So, while it's important to keep a bottle on hand, that doesn't mean you can eschew your hair appointments altogether. What To Look For in Purple Shampoo Purple shampoos cancel out unwanted yellow tones in the hair,” says Bodt. If you’re a faux-blonde looking for upkeep, purple shampoos are an essential investment. “For blondes who are looking for more neutral, cooler, or ashier tones, purple shampoos can help offset the warmer tones that appear in blonde hair over time,” adds Lynch. 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.