Purple Shampoo: Why and How to Use It to Neutralize Yellow Tones

|Luc Vincent

You've invested time and money to achieve a luminous blonde or to embrace your natural grey hair, but unwanted yellow tones are dulling the results? Purple shampoo is your best ally. Used by professionals for decades, this pigmented hair treatment neutralizes brassy tones and restores your hair's full brilliance. Here's everything you need to know to make it part of your routine.

What is purple shampoo and how does it work?

Purple shampoo, also known as anti-yellow shampoo, is a cleansing treatment infused with violet pigments. It works on the principle of complementary colours: on the colour wheel, violet sits directly opposite yellow. By depositing micro-pigments onto the hair fibre, the shampoo effectively neutralizes yellow and orange tones that naturally appear over time.

Unlike a colour treatment, purple shampoo doesn't alter the hair's structure. It works on the surface, creating a subtle corrective veil that gradually fades with each wash. It's a maintenance product, not a permanent treatment — which makes it both effective and easy to use on a regular basis.

Who should use purple shampoo?

Purple shampoo isn't just for platinum blondes. Here are the hair types that benefit most from this kind of care:

  • Natural or colour-treated blonde hair — to maintain a cool, luminous blonde free of brassy undertones
  • Bleached or highlighted hair — to extend the time between salon touch-ups and keep results looking fresh longer
  • Grey or white hair — to eliminate the yellowish cast caused by pollution, sun exposure, or certain styling products
  • Light brown hair with balayage — to revive highlights and maintain contrast between strands

If you notice your blonde or grey hair taking on an unwanted warm tone between salon visits, a pigmented blonde hair shampoo is the simplest, most accessible solution.

How to use purple shampoo properly

To get the most out of your anti-yellow shampoo without risking an overly tinted result, follow these steps:

  1. Thoroughly wet your hair. Hair that's fully saturated with water allows for even product distribution and prevents pigment from concentrating on more porous areas.
  2. Apply a moderate amount of purple shampoo to the palms of your hands and distribute it evenly from roots to ends.
  3. Gently lather by massaging your scalp with your fingertips. Make sure the product covers your entire head of hair.
  4. Leave on for 2 to 5 minutes. That's the time the pigments need to work. For your first try, start with 2 minutes and adjust based on the results.
  5. Rinse thoroughly with lukewarm water until the water runs clear. Insufficient rinsing can leave visible purple residue, especially on very light hair.

Pro tip: if your ends are more porous than your roots (which is common with bleached hair), apply the shampoo to your roots first and work it down to the ends only during the last minute of processing time. This prevents the ends from absorbing too much pigment.

How often should you use purple shampoo?

The ideal frequency depends on your hair type and how much yellowing you're experiencing:

  • Colour-treated or bleached blonde hair: 1 to 2 times per week, alternating with your regular hydrating shampoo
  • Grey or white hair: once a week is usually enough to maintain a brilliant grey
  • Naturally blonde hair: once a week or every two weeks, depending on sun and pollution exposure

The most common mistake is using purple shampoo with every wash. Overuse can give hair a slightly violet or ashy cast, especially if it's highly porous. Remember: purple shampoo is an occasional corrective treatment, not an everyday cleanser.

Monitor the appearance of your hair over the weeks and adjust the frequency accordingly. If yellow tones return quickly — which can happen in summer or if you swim regularly — you can increase to two uses per week.

Sans Yellow Purple Shampoo by Luc Vincent

The Sans Yellow Shampoo by Luc Vincent was specifically formulated to meet the needs of blonde, bleached, and grey hair. Developed in Quebec, it combines highly concentrated violet pigments with nourishing ingredients for a dual-action formula: neutralizing yellow tones while caring for the hair fibre.

What sets our formula apart:

  • Micro-dispersed violet pigments — for effective neutralization from the very first use, without depositing heavy residue
  • Nourishing action — bleached hair needs hydration, and our formula cleanses gently without stripping moisture
  • Professional-grade formulation — developed with hairstylists to deliver salon-quality results at home

The result? A cooler blonde, a purer grey, and hair that stays soft and shiny between salon visits. Discover the full Sans Yellow collection for a complete anti-yellow routine.

Complete routine for blonde and grey hair

For optimal results, incorporate purple shampoo into a complete haircare routine designed for hair that's been weakened by bleaching or is naturally prone to yellowing:

  1. Wash with Sans Yellow Shampoo once or twice a week. On other wash days, use a gentle, hydrating shampoo.
  2. Condition after every wash with a conditioner suited to colour-treated or bleached hair to seal the cuticles and lock in moisture.
  3. Apply a leave-in treatment to lengths and ends to protect the hair fibre from heat and environmental damage.
  4. Shield your hair from the sun in summer — UV rays accelerate yellowing and colour degradation.
  5. Space out your washes whenever possible. The less frequently you wash, the longer your colour and anti-yellow treatment will remain effective.

If you're in the middle of a transition to natural grey, purple shampoo becomes an especially valuable tool. It helps maintain a clean, uniform grey while your natural growth gradually replaces the colour.

Recommended products