Unlock the full potential of your hair color with Paul Mitchell HT Processing Cream Developer 12.0% 40 Vol 90ml. This high-performance developer is designed to work seamlessly with Paul Mitchell's color lines, ensuring optimal lift and color deposit for stunning, long-lasting results. With a 12.0% (40 volume) strength, this developer is ideal for achieving maximum lift in your color processing, making it perfect for dramatic color changes and lightening. Enhance your hair coloring experience and achieve vibrant and long-lasting color with the confidence of professional-grade performance.