Our Revlon 3D Color Gel Technology™ delivers natural-looking, multi-tonal color, giving your hair definition and dimensionality from root to tip. Please follow the box instructions closely, but here are a few important points you might want to know right now about this hair color kit. For the best results, apply the hair color first to your roots in small sections (about 1/8″ each). The typical leave-on time for allover color is 25 minutes, but if you have particularly stubborn grays, add 5 more minutes (so 30 minutes total). Using Ultra Blonde shades 03, 04, or 05? Add an additional 20 minutes to the usual time frame (so 45 minutes total on your head).