Colour-treated and glossed hair that tends to look dull between appointments. It works for anyone who wants a sulfate-free wash focused on shine and colour longevity rather than repair.

This is a retail shampoo for home use, part of a four-step routine that clients can follow after a salon colour or gloss service.

Most colour-care shampoos stop at being gentle. Acidic Color Gloss goes a step further by using an acidic pH to close the cuticle, which is what makes colour look glossy rather than flat, and Redken backs it with measured results for colour vibrancy and shine. If your colour looks great leaving the salon but dull a week later, this is the shampoo built around that problem.

• Apply to wet hair.
• Lather, then rinse.
• For the complete routine: follow with Acidic Color Gloss Activated Glass Gloss Treatment, Acidic Color Gloss Conditioner and Heat Protection Treatment.

Pros:

• Acidic pH helps seal the cuticle, which is what gives the extra shine
• Sulfate-free, gentler on colour than a standard shampoo
• Redken's test claims: colour vibrancy up to 32 washes and up to 76% shinier hair within the system
• Litre size available for regular users

Cons:

• Best results are claimed for the full system, which means buying several products
• Fragranced
• Not a repair or bond-building shampoo; very damaged hair may need a bonding line