No. Violet pigment sits on the hair surface and washes out over a few normal shampoos. Leave it on too long on porous or very light hair, and you can get a faint tint, which a clarifying wash lifts out.

Once or twice a week, or whenever brassy tones creep back. Daily use can leave hair dull or faintly purple, especially on fine or porous hair. Rotate with a regular shampoo the rest of the week.

Purple cancels yellow (blonde, platinum, silver, grey hair). Blue cancels orange (brunettes, balayage, dark blondes). Matrix Brass Off and Devacurl No-Poo Blue target orange; Fanola No Yellow and L'Oréal Silver target yellow. If you've got both, alternate.

Fanola No Yellow is one of the strongest on the market and what most Australian salons use at the basin. Olaplex No.4P is the strongest option that also repairs bond damage in the same wash, useful if your hair is fragile. Both suit level 9-10 hair, used once a week with a hydrating mask.

Different products. Purple shampoo (this page) uses violet pigment to cancel yellow brassiness in blonde, platinum, silver, or grey hair. Shampoo for purple-dyed hair is a colour-care product designed to stop the dye fading. For bright-purple-dyed hair, look in our colour shampoo range, not here.

No, purple shampoo does not directly cause hair loss. However, some cheap or harsh purple shampoos can dry out your hair and scalp. This can lead to breakage, which makes your hair look thinner. Make sure to only use quality purple shampoo.