The purple shampoo can cause build up making the hair look dull and darker if overused." This makes the lightening process more difficult to create a seamless blend.
If you use purple shampoo too often, you may notice a slight purple hue on your hair—especially if you have very light or damaged hair. If this is the case, try using purple shampoo a few times a week instead of daily.
How Often Should You Use Purple Shampoo? Purple shampoo is meant to only be used weekly or when your hair is looking brassy — not every day. Generally, you'll want to incorporate it into your hair care routine one to three times a week in place of your usual shampoo for color-treated hair.
Unless you have white hair or gray hair, you shouldn't leave the purple shampoo on for longer than 15 minutes at a time. If you're already leaving the shampoo on for less than 15 minutes and you're noticing a purple tone, then try leaving the product on for even less time.
If your hair is on the yellowish, orange end of the spectrum, purple shampoo will fix it. Like blue shampoo, purple shampoo is another at-home option that's formulated to neutralize brassy yellow and orange tones in color-treated hair. It's primarily used to tone blonde (or lightened), color-treated hair.
Zoe's answer: Leaving purple shampoo in your hair for longer than the recommended time is not always a good idea. The longer you leave it, the more pigments will be deposited on your hair and they could even stain it permanently.
Keep in mind that purple shampoo does not replace your regular shampoo and should only be used once or twice a week. Doss warns that there is such a thing as too much purple. “When you eliminate too much yellow, it visually ends up darker and a lot of people don't want it to look darker,” she says.
Purple shampoo is for already bleached hair, so if you're hoping to lighten brown hair with purple shampoo, you'll be disappointed. This is all down to the fact that purple shampoo isn't lightening. Instead, it brightens blondes by canceling out yellow tones, which just happen to be opposite purple on the color wheel.
Leave in for 3-5 minutes before rinsing, then follow with Redken Colour Extend Conditioner. Purple shampoo is popular not only with coloured blondes, but also natural blondes, those with grey hair that tends to yellow, and even people who have darker hair with brassy tendencies.
Leaving purple shampoo in your hair for an hour or more can cause your hair to look dull and lifeless. To leave purple shampoo for more than 10 minutes is already too much.
“Purple shampoo does not cancel out orange so if the hair has any orange or yellow orange tones in it, the purple shampoo would actually make them warmer depositing red into the hair.”
"Alternate your purple shampoo with a moisturizing shampoo," says Wiley. "Depending on how brassy your blonde hair is, you won't need to use the toning effects every wash, and it is important to add moisture and strengthen hair during the color process to keep hair healthy and strong."
Why purple shampoo is bad for your hair? Did you know that most purple shampoos can make your hair too dry? It's designed to remove brassiness from your hair, but if used incorrectly they can leave a buildup on your strands that makes them brittle and dull.
DON'T use purple shampoo before your colour appointment
As Anneliese said, it's important not to use purple shampoo in the run-up to your colouring appointment. “Stop using purple shampoo a week or so before you have your colour done,” advises Jimmy.
Because it does not contain an ingredient that will chemically change the color of your hair, purple shampoo cannot truly lighten hair. If anything, purple shampoo may make your hair temporarily slightly darker.
Purple shampoo works the same way to eliminate brassiness on brown hair as it does on blonde. It helps to prevent color fade, while emphasizing shine, keeping brown hair vibrant and rich. Using purple shampoo on brown hair regularly will take out any unwanted warm tones in your strands.
However, we've created the 'Goldilocks' of purple shampoos; a product with just the right level of purple tones, which takes 3-5 minutes to work its magic on brassy strands.
How Long Do You Need To Leave Purple Shampoo In Your Hair? Be careful how long you leave it on with each use, as leaving it too long can cause changes to your hair's color. It only needs to be on for 5-10 minutes at most.
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.
OK, so what is the best way to use purple shampoo? Well, for starters, you want to apply it on completely wet hair. (Note: If you have especially dry or brittle ends, we'd also recommend putting a tiny amount of conditioner on just the tips to prevent them from absorbing too much pigment.)
Maintaining Your Hair Color
Alternate your purple shampoo use with regular shampoo formulated for color-treated hair so your hair color stays light and even.
Purple counteracts yellow, blue counteracts orange. They are opposites on the color wheel, so that's why. So if your hair has an orangey hue, the reality is, purple shampoo won't work. Because purple doesn't solve an orange problem.