The Vitamino Colour Spectrum Glass Shine Serum from L'Oreal Professionnel provides instant glass shine and long-lasting shine for up to 5 washes. Enriched with 5% alpha-silane, the serum forms a protective layer on the hair surface when activated by heat. The result: ultra-strong glass shine. Long-lasting frizz control for up to 72 hours. Protection against humidity of up to 80%. Heat protection up to 230°C. Hair is instantly conditioned, smoothed and softer. Pro tip: For coloured hair, use the serum with the complete Vitamino Color Spectrum routine to maintain the colour brilliance of day 1 of colouring. *Instrumental test.