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." Again not much difference and very subtle. I will keep using the product to see if regular use has more of an effect but not too keen as it has a strong scent, like most purple shampoos. 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. 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. 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."

Touch Of Silver Purple Toning Dry Shampoo 200 ml PRO:VOKE Touch Of Silver Purple Toning Dry Shampoo 200 ml

How? Well, over time, lightened sections of brunette hair can turn brassy and the colour fades. This can occur especially in balayage or ombre hair, or if the hair has been dyed multiple times before. The hair can often become dry and damaged and reveal the underlying pigments which are warmer and more yellow/orange in hue. Of course, some people will like this tone, however, if you don’t, purple shampoo on brunette hair can be your saviour to take out any unwanted warm tones in your hair. I’m a true advocate for purple Shampoo. I have a go to brand that I use regularly, knowing it works well and does what it says on the tin-neutralises orange/yellow tones and refuses brassiness. 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. 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.

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Next, smooth over a generous amount of the Touch Of Silver Intensive Conditioner – ideal for use after the Brightening Shampoo to regain hair health and balance. Leaving this on your hair for 3 to 10 minutes will nourish hair and intensively target dry and damaged strands. It has a rich and luxurious formula which improves your hairs condition after just one use. 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. But Zoe Irwin, creative director at John Frieda Salons, advises clients to be careful as purple-based products can be drying.

ProVoke Purple Shampoo for Blonde Hair Eliminates PRO:VOKE ProVoke Purple Shampoo for Blonde Hair Eliminates

The secret’s out! Our purple shampoos aren’t just for blondes. Get the lowdown on using our Touch Of Silver products to make your brunette look amazing too. 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. 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." Redken’s Color Extend treatment shampoo is enriched with a deep violet pigment that’s extremely effective at cooling warm undertones and counteracting yellow tones. As well as working wonders to clean up dull blonde shades, the hydrating shampoo uses a Triple Acid Protein complex to strengthen the hair cuticle and nourish each strand. These fortifying proteins hydrate and protect each strand to prevent the damage that’s a common side effect of bleaching and toning hair. This is a strong colour-correcting shampoo, so we recommend wearing gloves while massaging it into hair to prevent staining on the hands. You’ll only need to leave it in the hair for a few minutes. For an extra blonde-boosting benefit, follow with the conditioner and conditioning treatment mask in the same range.What Shannon says: "I've been bleaching my hair for over 15 years, and the damage needs a lot of management. The bond-restoring benefits of this purple shampoo means my long hair is left feeling stronger, looking less brassy and is less prone to breakage."