If you leave blue shampoo on for too long (whether you have damaged or healthy hair), you run the risk of leaving a noticeable blue tint on your hair instead of only neutralizing the brassy tones. Much like the aforementioned Fudge option, this purple hue packs a serious punch, leaving blonde cool, icy and fresh looking. It adds luster to the hair strands and enhances the intensity of the color so it looks bright and even. This super affordable shampoo brightens silver tones and keeps the lightest blonde shades 'ice ice baby'.

For brunettes with brassiness that has more of an orange, red, or copper tint, the best color to use is blue. 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. Nourishing Formula: The hair-lightening treatment removes your scalp’s natural moisture, so side with a nourishing formula containing argan oil, keratin, avocado oil, vitamin A, amino acids, green tea extracts, and soybean oil.It transforms into a rich, creamy lather, smells beautiful and leaves hair looking glowing and soft. If you used it every day (which I wouldn't recommend) I reckon you would be almost silver within the month.

Its purple pigments draw out brassiness and neutralise those unwanted tones, keeping your colour cool and brass-free. This anti-orange toning shampoo is ideal for hair color maintenance, adding color and consistency to dark blonde, platinum, and decolored hair. Working in under 2 minutes, this fast-acting primer transforms your tone, leaving hair brighter and lighter for your most even blonde yet.To understand how blue and purple shampoos work, Grand says we have to quickly go back to middle school art class. What Shannon says: "This shampoo is so good that if you leave it on for too long, you will notice a slight purple tint to your blonde immediately after washing.

If you remember the color wheel, purple cancels out gold while blue cancels out orange,” she explains.

After you've rinsed the blue shampoo out, lather on your favorite hair conditioner to replenish moisture and boost shine. What Sunil says: "I was recommended this product by a beauty editor with many years of industry experience, so naturally I had to give it a go. The Not Your Mother’s Triple Treat Brunette Blue Treatment Shampoo is formulated with blue tansy oil and deep blue pigments. Made with max-strength blue micro-pigments and our unique Opti-PlEX™ technology, it instantly erases red and orange tones, while helping to repair damage and smoothing the cuticle. The shortlisted products are formulated with nourishing ingredients and work best on gray, brown, and dark hair colors.

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. I decant half my purple shampoo into half a bottle of Oribe Shampoo For Moisture Control," she says. If you're not rocking blonde hair yourself, we've also done a roundup of the best blue shampoos for brown hair. 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. What Katie says:"Redken is known for being a colour-expert brand, as well as one that pushes the boundaries of traditional colour.This is because free radicals in the colouring process break down protein so blonde hair becomes porous. However, while purchasing the best blue shampoos, you should also avoid the brands that cannot protect your tresses against pollution or external aggressors. The things that they particularly focused on were: how the shampoo left hair feeling afterwards - did it feel dry at all or soft to the touch, how long the effects lasted and -most importantly - how well it took down brassiness. The Roffler Thick and Rich Shampoo Blue Formula is specially formulated for dark brown or blue-gray hair. 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.