• The 10, 20, 30 Volume dedicated COLORINSIDER™ Oil-Cream Developers are mixed 1:1 and provide up to three full levels of lift. • COLORINSIDER™ is time-efficient—it reduces processing time from 45 minutes to 35 minutes. • In addition to the traditional letter shade system, COLORINSIDER™ features an alpha-numeric system for precise color selection and results. (For example: 9GC = 9.34). Both are displayed on all product boxes and swatch tools.