Schwarzkopf Professional Blonde Premium Care Developer 12% 40 Volume 33.8 Schwarzkopf BlondMe Premium Developer Oil Formula is a high-quality professional developer designed to work seamlessly with BlondMe Toning and BlondMe Lightener. Infused with nourishing mineral oil, this developer helps maintain the natural moisture balance of your clients' hair while reducing water content, preventing the dilution of essential ingredients like color, alkalizers, and peroxides. The result is healthy, shiny, and soft blonde hair that radiates brilliance