The PRAVANA creme developer allows the stylist to perform permanent or semi-permanent ChromaSilk coloring services. 10 volume - Level of lift: Minimal Processing time: 30 minutes 20 volume - Level of lift: 1 level (standard for gray coverage) Processing time: 35 minutes/45 for resistant gray 30 volume - Level of lift: 2 levels (for lighter brighter effects) Processing time: 40 minutes 40 volume - Level of lift: 3 levels (for maximum lift) Processing time: 45 minutes 30 or 40 + 000 - Level of lift: 4 levels (for super lighteners) Processing time: 45 minutes