Redken Pro-oxide Cream DeveloperRedken's Pro-oxide Cream Developer is the dedicated developer for Redken's hair color lines, designed to mix with hair color for an ideal consistency. It ensures controlled and precise applications.How to Use: Mix Color Fusion in a 1:1 ratio with 10, 20, 30, or 40 vol. Pro-oxide Cream Developer for up to 4 levels of lift. Apply Color Fusion using a bowl and brush or bottle for either Traditional or Modern Virgin Application. Apply color generously using fine 1/4" diagonal partings and cross-check the application. Process at room temperature for 35-45 minutes. Follow with Color Extend Shampoo and Conditioner for best results. Ingredients:Please be aware that ingredient lists for the products of our brand are updated regularly. Please refer to the ingredient list on your product package for the most up-to-date list of ingredients to ensure it is suitable for your personal use.