We also test shampoos in the Lab using a swatch-wash station in a process where exact doses of each formula are dispensed onto human hair swatches of different textures and types. This allows us to calculate cleansing ability. Last, all of the testing data points (usually in the thousands!) are tallied to determine the winning formulas. How to find the best shampoo for your hair type Conditioning ingredients give a good hit of hydration for softer hair, with a shot of shine thrown in for good measure. 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. 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? If you have coloured blonde hair, the last thing you want is for your hair to go brassy and yellow. Unfortunately, it's very common for colour-treated hair to change tone, especially through exposure to the sun, environmental pollutants and other factors.

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? If you have never used purple shampoo before, try leaving it in for 5-10 minutes before washing it off. If you notice little or no difference in colour after drying your hair, try increasing the time to 10- 20 minutes for your next treatment. For dry hair, shop "moisturizing,” “hydrating,” “nourishing,” “replenishing” or “softening.” These shampoo and conditioner formulations are made with higher quantities of conditioning ingredients to coat strands, making them silkier and more supple. Make sure to use a purple conditioner after your purple shampoo," says Mondo. (Two of my favorites? Bumble and Bumble's Illuminated Blonde Purple Conditioner and Morrocanoil Blonde Perfecting Purple Conditioner.) "Shampoo is mainly focused on the root area, so you want to make sure you're also covering those ends with that violet pigment to ensure even results from roots to ends." Morgan agrees, explaining that sometimes these shampoos can be drying to some hair textures, so he prefers to follow up with a hydrating hair mask. How to find the best purple shampoo Understand how it works 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?!It's important to understand that purple shampoo will work differently on all hair types. This is particularly the case if you have dry, bleached, or color-treated hair. Considering many people in the market for purple shampoo have chemically processed hair, it's important to know that you can actually overuse the shampoo, resulting in more of a purple tinting rather than a toning. The best way to avoid this? Start slow and work up from there if you find your hair needs it. Although individuals with darker hair may worry about draining their hair of colour, silver and platinum coloured hair benefits from leaving the shampoo in longer. If you have a naturally blonde or a warm, mildly brassy blonde hair colour, let the shampoo sit for about 3-4 minutes. Leave for 15 minutes on brassy or colour-treater hair. Leave for 30 minutes on grey, silver or platinum hair. After that time has passed, rinse your hair out with cool water. Since your roots have a lower porosity than your ends, they will need more time to absorb the shampoo and as such, the shampoo will need to be applied there first. It might say blonde on the bottle but, don't worry, this radiance shampoo works just as well on your grey.

For color-treated hair, shop “color protection,” “fade protection,” “color care” or “color safe.” These procuts have gentler or lower ratios of cleansers and more conditioners to prevent color loss. When we test shampoos, the products are first label-blinded by Lab scientists to eliminate brand bias and distributed to testers across the country to use in their hair routine at home. Consumers then evaluate the products on their performance, including how well they cleanse hair, how they make hair look and feel, and ease of use, from dispensing to lather, scent, how well they rinse, irritation level, and more. Condition your hair as you normally would with an anti- yellow conditioner to moisturise your hair. Purple conditioner will strengthen the tone’s intensity. Wet your hair with warm water. The temperature helps to expand your hair shafts, allowing them to better absorb the anti-yellow shampoo. It's a simple process, explains Morgan. "Massage the shampoo in your hands until it suds up, and then apply it to wet hair," he says. "Massage the product throughout the hair and leave on for one to five minutes depending on the level of brassiness."Sure, it's always tempting to go lighter (I legit contemplate this weekly), but one thing no one tells you about being blonde? It’s super high-maintenance—besides the constant root touch-ups and weekly deep conditioning masks, if you use the wrong shampoo, your beautiful blonde could turn, uh, yellow? Yeah, not great. For frizzy hair, shop “smoothing,” “polishing,” “frizz control,” “frizz protection” or “anti-frizz.” Your strands need good conditioning in both shampoo and conditioner formulas to infuse hydration and to smooth hair’s surface, preventing pouf. functions,” explains GH Beauty Lab Director Birnur Aral, Ph.D. “Mixing brands and collections may produce less effective results, including under- or over-conditioning.”