The 6 Effects Serum provides hair with a combination of six nourishing benefits that support & perfect it. This serum increases colour luminosity, nourishes hair fibres, improves elasticity, improves silkiness, increases shine & provides healthy looking lengths & ends. The addition of Luminescine technology converts UV light into visible light which, in turn, increases the brightness of the hair & makes colour appear more radiant. For coarse hair.