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COLOUR + STRENGTH + ZERO AMMONIA, ALL IN ONE. Clairol Colour Strong 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.