Professional-grade developer formulated to work seamlessly with Schwarzkopf Igora Royal hair color. This 33.8 oz bottle provides ample product for multiple applications, making it ideal for salons and frequent colorists. Delivers consistent, reliable results with excellent mixing ratios and color deposit. Choose your preferred strength to customize lift and processing time based on your hair color goals. Essential for achieving vibrant, long-lasting color results with the Igora Royal system.