Gives you the ability to mix, match, and create over 1,000,000 different shades of color before applying your dye! Contains 9 colors in 21 different levels of intensity. Use by overlaying colored slides containing the primary, secondary and tertiary colors. Takes all the guess work, wasted dye, lost time and potential liability out of spot dying, color restorations, color changes and dye formulas. Also makes an excellent marketing tool for showing customers the amount of color loss and the final results before you start the job.