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Olaplex No. 9 Bond Protector Nourishing Hair Serum 3oz / 90ml DEMI PERMANENT Will it yellow or darkenOlaplex No. 9 Bond Protector Nourishing Hair Serum is a weightless leave in serum that shields hair from heat, pollution, and daily damage, in a 3oz 90ml bottle. Olaplex No. 9 Bond Protector Nourishing Hair Serum is a weightless, leave in styling serum rich in antioxidants. It helps protect hair from pollution, heat, and future damage while adding shine, bounce back curls, and anti static, anti tangle action. Use it on clean, damp hair and reapply