Stellar Professional Developer 9% (40 VOL) 100ml is a high-strength oxidizing lotion used in hair coloring and lightening processes. With a 9% (40 volume) formulation, it provides significant lifting power to help lighten hair several levels when mixed with bleach or high-lift color. Its consistent, creamy texture ensures smooth application and even color development for professional-grade results. Designed for use by experienced stylists or careful at-home users, this developer supports effective lightening and color transformation while helping hair absorb pigment uniformly. Always follow instructions and safety guidelines for optimal performance and hair health.