Blue shampoo

They don't correct the same tone. Blue neutralises red and orange tones, the ones that come through when you lighten a light brown, brunette or dark blonde base. Purple neutralises yellow, the kind you get on already light blondes and polar blondes. If your tone leans coppery, go for blue. If it leans yellow, go for purple.

No, and that's normal. Blue corrects a warm tone created by lightening. On a naturally dark base that hasn't been lightened, there's no such tone to correct, so you won't see anything. However, if your highlights or balayage on a dark base are pulling orange, that's exactly where it works.

1 to 3 minutes depending on the intensity you want, then rinse thoroughly. Don't go beyond 3 minutes: after that, the result can turn the hair fibre grey instead of correcting it.

1 to 2 times a week, no more, in place of your usual shampoo. Focus on the areas that pull orange, then carry on with your normal routine.

Not in the same wash. These are two correctives for two opposite tones, and using them both at once can dull your blonde. Pick the one that matches the tone you're dealing with right now. If you have both shades in different areas, alternate from one week to the next.

It's formulated with 86% naturally derived ingredients, including ginseng, wheat proteins and betaine that support the hair fibre during the correction. Like any pigmented shampoo, you don't use it every day: 1 to 2 times a week is enough.

About 3 months with 1 to 2 uses per week. 250 ml bottle.

When you lighten dark hair, the pigments are removed in stages: brown goes through red, then orange, then yellow before reaching a light blonde. The darker your base, the earlier the lightening stops in that sequence, so the more the leftover tone leans orange. Gradual lightening limits that shift, and that's exactly what our lightening spray does.