L'Oréal Professionnel Vitamino Color Spectrum Glass Shine Serum provides long-lasting colour intensity with a luminous, glass-like sheen. Its unique heat-activated formula protects coloured hair against frizz, fading, and humidity, maintaining vibrancy for up to 10 washes. Engineered to preserve salon-quality colour for up to 100 days, it offers UV and heat protection up to 230°C. For best results, apply before straightening. This serum boosts shine, colour depth, contrast, and brightness, delivering a sleek, radiant finish while safeguarding colour durability.