But Zoe Irwin, creative director at John Frieda Salons, advises clients to be careful as purple-based products can be drying. Essentially, blue toning shampoo erases brassy tones to reveal cool, neutral browns. Which is the best blue shampoo? While purple shampoo is typically the best bet for blondes, blue shampoo is often a better option for brunettes who have lightened their strands with balayage, ombré, or conventional highlights as their underlying tones tend to be more orange. Blue shampoo can be used once a week, while blue conditioner can be used twice or thrice a week. Blue Shampoo is used the same way as normal shampoo, except you need to leave it in for 3-5 minutes before rinsing it off so it can penetrate into the hair. The conditioner can be kept on your hair for about 2-10 minutes to effectively neutralize brassy tones. Blue shampoo benefits natural and dyed brunettes who don’t have lighten ed sections. Purple Shampoo For Blonde Hair

About the Expert: Lana Grand is a Los Angeles-based celebrity hairstylist and colorist with over 17 years of experience in the beauty industry.

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It's arguably blonde hair's biggest nemesis: brassiness. Why does it happen? "Lighter strands often struggle to look shiny and healthy," says Steve Shiel, scientific director at L’Oréal. "This is because free radicals in the colouring process break down protein so blonde hair becomes porous." Purple shampoo is a cleansing toner that helps to keep your blonde and lightened hair looking fresh and vibrant . Its purple pigments draw out brassiness and neutralise those unwanted tones, keeping your colour cool and brass-free. Dry Hair: Look for a shampoo with additional moisturization and conditioning benefits. Opt for formulas infused with hyaluronic acid, vitamin E, shea butter, coconut oil, argan oil, and other essential oils that boost your hair’s moisture. Those who bleach their hair and live in hard water areas (which creates more mineral build-up on strands), should only use it once a week. Meaning, one bottle will last you until your next colour appointment, if not longer. Type Of Hair: Ideally, choose a shampoo that caters to your hair type to ensure maximum efficiency.

The easiest way to flaunt a beautiful shade of blonde is to maintain your colour with a purple shampoo and conditioner .Purple shampoo is the precursor of toning and color-correction. It works particularly well on blonde or lighter hair colors, while blue shampoo is ideal for brown or darker hair. Purple shampoo came to the market before blue shampoo. While purple shampoo is specifically created to revive blonde hair color, the blue shampoo works well on both blonde and brown hair. Can’t wait to add blue shampoo to your shower routine? We’ve got good news: Incorporating this product into your existing haircare system couldn't be simpler. Simply wet your hair in the shower with warm water and swap the shampoo you normally use for the blue shampoo of your choice. Just like any other shampoo formula, these toning shampoos act as a cleanser while also eliminating unwanted orange tones. 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. When lightened, color-treated hair is exposed to heat, certain hair products, or environmental factors (like pollution or the sun), you'll eventually start to see the hair color change—most often revealing brassy tones. Grand explains that this happens because "human hair is comprised of color pigments that are usually invisible to the naked eye," but when the hair is colored, all those pigments rush to the surface. For blondes, these underlying pigments tend to have a golden or yellow color, but for brunettes, it's more common for these pigments to have orange, red, or copper tones. If you’re a brunette with virgin hair (aka hair that has never been color treated), you can use blue shampoo occasionally to brighten your strands and help your dark hair appear shinier. Blue shampoo is also a great option for those with grey hair or silver hair if the hair begins to look orange or brassy, and it’s usually best for brunettes who are going or have already gone gray. For blondes who have gone gray, purple shampoo may be a better fit—but it all depends on your hair's undertones. Remember, orange tones = blue shampoo, yellow tones = purple shampoo. How to use blue shampoo