Available in two sizes: 16 oz or 32 oz Most permanent hair color services use 20 Volume, and there is a reason. Matrix Universal Developer 20 Volume is the standard professional developer for permanent hair color services, providing controlled lift, reliable gray coverage, and consistent color deposit across the full SoColor range. Professional Benefits 20 volume developer for standard lift and reliable gray coverage The most versatile developer for everyday permanent hair color services Provides controlled, predictable lift without over-processing or excessive damage Compatible with all Matrix SoColor permanent hair color formulas Available in 16oz for regular use and 32oz for professional or high-volume services How to Use Mix with Matrix SoColor or Extra Coverage in the recommended ratio Apply to dry hair section by section Process 30 to 45 minutes. 45 minutes for resistant gray coverage Rinse thoroughly and follow with a color-protecting treatment Use as the standard developer for all permanent hair color services Pro Tip: 20 Volume is the professional default for permanent hair color because it covers the widest range of services reliably. Only move to 30 or 40 Volume when additional lift is specifically required, using higher volume than necessary increases damage risk without improving gray coverage.