Colour and Strength with Zero Ammonia. All in one. Clairol ColourStrong gives you multidimensional colour and reinforces the internal structure of your hair.* What's the secret? The continuous system with colour + bonding has AHA (alpha-hydroxy-acid) in every step: Bonding Primer, Permanent Colour and Bonding Treatment. Zero ammonia + 100% grey coverage. Sublimely multidimensional colour. *Reinforces hair strength when using ColourStrong full kit vs. ColourStrong colour step only
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