Olaplex N4P Blonde Enhancer toning shampoo for bright blonde hair 250 ml. This Olaplex Blonde Enhancer shampoo is ideal for reviving blonde hair by giving brilliant highlights and an immediate anti-yellow effect. Its patented technology protects the internal structure of the hair, while the toning pigments illuminate the hair with elegance. Hair immediately appears brighter, silkier and more cared for. Characteristics: intense anti-yellowness, restructured hair, brilliant cold tones, protects the fiber.