This product is formulated to lift and condition gray hair in as little as 10 minutes. It also contains 15 permanent colors that help to cover 100% gray hair, brighten blondes, and enhance brunettes. It also provides long-lasting color that can be applied in less than 10 minutes. It also adds subtle accents to enhance the natural look of short hair clients. How to use it: Mix Studio Stylist Express Color Creme and Studio Stylist Express 20-Volume Developer for 10 minutes. Rinse hair thoroughly and apply. Not using Styrogrog