Why Purple Shampoo Is Used After Highlights
Purple shampoo is a violet-toned formula designed to counteract yellow and brassy tones in lightened hair. After highlights, exposed hair strands often have a warmer undertone because the bleaching process lifts the natural pigment and leaves behind unwanted warm hues. According to L'Oréal Professionnel, toning products like purple shampoo work by depositing a subtle violet pigment that visually neutralizes brassiness without altering the highlight placement or color formula used by the stylist. This makes it a standard step in post-highlight maintenance routines for blonde, silver, and gray hair. L'Oréal Professionnel
Hairdressers and colorists recommend using purple shampoo only after highlights have been fully processed and rinsed out. Applying it too early, such as during the same appointment, can interfere with the toner or glaze a stylist may apply immediately after lightening. The timing depends on the highlight technique, the level of lift, and the desired tone. For example, balayage and foils often require a different post-color wash schedule than full-head bleaching. Sephora
When to Start Using Purple Shampoo After Highlights
Most professional colorists advise waiting at least 24 to 48 hours after a highlight service before using purple shampoo at home. This waiting period allows the hair cuticle to close and the new color to stabilize, reducing the risk of fading or uneven toning. Redken states that freshly highlighted hair is more porous and sensitive, so immediate washing with any strong shampoo, including purple formulas, can strip moisture and accelerate brassiness. Redken
For platinum, silver, or high-lift highlights, many salons provide a post-color care schedule that specifies when to introduce toning products. In some cases, a salon-applied toner is used immediately after highlights, and purple shampoo is reserved for later maintenance washes. The exact schedule depends on the hair's porosity, the developer volume used, and the desired cool or ashy finish. L'Oréal Paris
How Often to Use Purple Shampoo After Highlights
Once the initial waiting period is over, most guidelines suggest using purple shampoo once or twice a week to maintain a cool tone. Overuse can lead to a violet cast or dryness, especially on fine or already processed hair. The frequency should be adjusted based on how quickly brassiness returns, which is influenced by UV exposure, hard water, and heat styling. Allure
Salons often pair purple shampoo use with specific conditioner or mask routines to protect highlighted hair from becoming brittle. According to Wella Professionals, alternating purple shampoo with a hydrating, sulfate-free shampoo helps preserve both the tone and the integrity of the highlighted strands. This balanced approach supports longer-lasting highlights and reduces the need for frequent salon toning services. Wella Professionals