For dark blondes and brunettes

Darker hair contains more underlying red and orange pigment than lighter blondes, so when it's lightened, those warm tones show through more prominently. This is a natural part of the lightening process and happens regardless of how carefully the hair is bleached.

Blue-based toning products cancel out orange tones, since blue sits directly opposite orange on the colour wheel. This makes blue shampoo and conditioner the standard solution for darker blonde, bronde, or lightened brunette hair with warm undertones.

Purple shampoo is formulated to cancel yellow tones, not orange, so it won't fully neutralize orange brassiness on its own. For orange tones common in darker blonde or bronde hair, a blue-based toning shampoo or conditioner is the more effective choice.

Most blue shampoos are best used 1 to 2 times per week, similar to purple shampoo, to avoid over-toning or leaving an unwanted blue-grey cast. Alternate with a hydrating or regular shampoo on other wash days.

Yes, using a blue conditioner alongside blue shampoo reinforces toning while also adding moisture and detangling benefits. This combination helps maintain balanced, brass-free colour between washes more effectively than using blue shampoo alone.