The Truth About Purple Shampoo for Blonde Hair

TL;DR:

• Purple shampoo neutralises yellow brass in blonde hair — that's it. It's colour theory, not chemistry magic
• It only works on light blonde, grey or silver hair — dark blonde and brunette won't see results
• Purple neutralises yellow. Blue neutralises orange. Using the wrong one explains why it "isn't working"
• Start with once a week for 2–3 minutes. More isn't better — over-use creates purple or grey-toned hair
• It's a maintenance product, not a colour treatment — it maintains tone, it doesn't change it

If you have blonde hair, you've been told you need purple shampoo. Whether it was your colourist, the internet, or that friend with perfect platinum hair — it comes up every time. Here's what it actually does, whether you need it, and how to use it without ending up with purple hair.

Meet the experts:
Royston and Warren at Cavendish Square — Judy, head trainer — Lewis, owner — Jackie at Gardens Centre — Debbie and Nikí at V&A Waterfront — Danny and Charlene at Canal Walk — Lynette, Samantha and Dominique at Constantia Village

01 — What Purple Shampoo Actually Does

Purple shampoo deposits violet pigment onto your hair while you wash it. Yellow and purple sit opposite each other on the colour wheel — when violet pigment lands on yellow hair, they cancel each other out, leaving cooler, more neutral tones.

"It's colour theory, not chemistry," says Lewis. "You're not changing your hair colour or making it lighter — you're adjusting the tone by depositing the opposite colour. It's the same principle a colourist uses when toning after bleaching, just in shampoo form."

The effect is temporary — it deposits on the surface and washes out gradually. You use it regularly to maintain the neutralisation.

02 — Do You Actually Need It?

Not every blonde does.

"You need it if your blonde is going yellow or brassy between salon visits and you want cooler, ashier tones," says Royston at Cavendish. "You don't need it if you like warm golden blonde. And you definitely don't need it if your hair isn't blonde — dark blonde and brunette hair won't see meaningful results from purple shampoo."

If you're happy with your colour, don't fix what isn't broken. Purple shampoo is a maintenance tool for people who want to keep cool-toned blonde between appointments.

03 — The Most Common Mistake: Using Purple When You Need Blue

Purple shampoo neutralises yellow. Blue shampoo neutralises orange. These are different tones and require different products.

"This is the number one reason people tell us purple shampoo isn't working," says Charlene at Canal Walk. "Their hair is pulling orange, not yellow. Orange is the warm tone that comes through on darker blondes or with some types of bleaching. Blue shampoo fixes that. Purple shampoo on orange hair does almost nothing."

How to tell: yellow brass looks golden or sunny. Orange brass looks warm copper or amber. If yours is orange, switch to blue shampoo.

04 — How to Use It Without Turning Your Hair Purple

Once a week, two to three minutes. That's the starting point for most blondes. Apply to wet hair, distribute evenly, leave for the time, then rinse until the water runs completely clear. Follow with conditioner — purple shampoos can be drying.

"The mistakes that cause purple hair are always the same — too long, too often, or on very porous hair that absorbs pigment faster," says Judy, head trainer. "Start conservatively. You can always increase frequency or contact time if you need more toning. You can't easily remove purple pigment once it's deposited."

If your hair does go too purple, wash a few times with regular shampoo. It's temporary and will fade. But prevention is easier.

05 — Which Purple Shampoo to Choose

Not all purple shampoos are the same. The intensity of pigment and the harshness of the formula varies significantly.

Very brassy or platinum hair: intense pigment formulas like Fanola No Yellow or Milk Shake Silver Shine. Lightly brassy highlights or balayage: gentler purple shampoos labelled for blonde rather than silver — you don't want to over-tone. Dry or colour-treated blonde hair: purple shampoos with moisturising ingredients or bond-building actives — some are very drying.

"Cheap purple shampoos with harsh sulphates dry out the hair while toning it," says Debbie at the Waterfront. "A better formula costs more but uses gentler cleansers, tones more evenly, and leaves the hair in better condition. For something you use weekly, it's worth investing in a good one."

06 — What Purple Shampoo Can't Do

It can't lighten hair. It can't fix a bad bleach job — if your hair is patchy or orange from poor bleaching, you need a salon visit. It can't repair damage. And it can't work on dark hair.

"I still see clients who think purple shampoo will make their hair lighter or turn them platinum," says Jackie at Gardens Centre. "It won't. It neutralises existing brassiness in already-light hair. If your hair isn't light enough for brassiness to show, purple shampoo has nothing to neutralise."

Frequently Asked Questions

How often should I use purple shampoo?

Once a week for most blondes with highlights or balayage. Twice a week for platinum or very light bleached hair. Every other week for natural blondes with subtle highlights. Adjust based on how brassy your hair gets and how much toning you need.

Why isn't purple shampoo working on my hair?

Likely because your brassiness is orange rather than yellow. Orange tones need blue shampoo, not purple. Or your hair is too dark for any pigment deposit to be visible.

Can I leave purple shampoo on too long?

Yes — and it will deposit enough violet pigment to turn hair purple or grey. Start with two to three minutes. If you need more toning, increase time gradually. On very porous or damaged hair, even short contact time deposits heavily.

Does purple shampoo damage hair?

Not the pigment itself, but some purple shampoos use harsh sulphates that dry the hair. Choose a sulphate-free purple shampoo and always follow with conditioner.

What's the difference between purple shampoo and silver shampoo?

Silver shampoo has stronger pigment, designed for grey or very light silver hair. It's too strong for most blondes and will over-tone. Stick to blonde-specific purple shampoo unless your hair is truly silver or grey.

Shop purple shampoos and blonde care at Partners Hair, or find your nearest salon for a toning consultation. Free delivery on orders over R390.