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Description Ingredients Experience the perfect partner for vibrant hair colour with Wella Welloxon Perfect Developer 4% 13 Vol. in the generous 1000ml size. Specially formulated to work seamlessly with Wella hair colour products, this developer delivers exceptional results every time. Its gentle yet effective formula ensures precise colour development and optimal coverage, while maintaining the integrity of your hair. With Wella Welloxon Perfect Developer, you can achieve the desired shade of your dreams, whether you're aiming for bold, vibrant hues or natural-looking tones. Unlock the true potential of your hair colour with the reliable performance and superior quality of Wella Welloxon Perfect Developer. Aqua, Cetearyl Alcohol, Hydrogen Peroxide, Sodium Cetearyl Sulfate, Paraffinum liquidum, Salicylic Acid, Disodium Phosphate, Phosphoric Acid, Etidronic Acid.