L'Oréal Professionnel Vitamino Color Spectrum Glass Shine Serum for Coloured Hair is a hair serum designed to enhance and protect coloured hair, delivering stunning glass-like shine and colour protection. This professional hair serum coats the hair's cuticle to lock in the five dimensions of colour spectrum – shine, saturation, contrast, tone, and brightness – while also providing anti-frizz control up to 24Hrs, anti-humidity, and heat protection. Formulated with 5% Alpha-silane, the hair serum creates a protective layer activated by heat, sealing in moisture, colour, and shine.