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Olaplex No.1 Bond Multiplier is a professional-grade concentrated formula that initiates the repair of damaged hair bonds during chemical services. It works by rebuilding broken disulfide bonds and preventing breakage while coloring or lightening hair. Key features: • Rebuilds broken disulfide bonds • Compatible with all manufacturer's color formulas • Allows for intense lightening while maintaining hair integrity • Good for approximately 70 applications • Must be mixed with color/developer before application For every 2oz (60ml) of color (excluding developer), add 1/16oz (1.875ml) of Olaplex No.1. For less than 2oz of color, use 1/32oz (1ml). Mix Olaplex with pre-mixed color and apply normally. After processing and rinsing, follow with Olaplex No.2 Bond Perfector for optimal results. This is a professional salon product that requires proper mixing ratios for effectiveness.