The mask is suitable for bleached or colour-treated hair, as indicated in its description for those with colour-treated lengths. Its formula does not contain harsh sulfates or clarifying agents that actively strip colour. To minimise any potential for colour fade, focus the application on the mid-lengths and ends of your hair, which typically need the most conditioning, rather than the roots. When rinsing, use lukewarm or cool water, as hot water can cause the hair cuticle to open more, potentially releasing some colour molecules. The conditioning agents in the mask, like guar hydroxypropyltrimonium chloride, help smooth the hair cuticle, which can actually help seal the hair shaft and may contribute to colour retention by reducing porosity and friction. As with any new product on colour-treated hair, it's wise to test it a few weeks after your colour service to ensure compatibility.