Revlon ColorSilk Hair Color, 30 Dark Brown 1 ea delivers natural-looking, multi-tonal color, giving your hair definition and dimensionality from root to tip. This specially blended, permanent hair coloring formula includes Revlon 3D Color Gel Technology, which delivers rich, multi-dimensional color that’s both natural looking and long lasting. It is enriched with keratin and silk amino acid, Color Silk's ammonia-free formula leaves your hair in better condition.This ammonia-free hair color delivers 100% gray coverage in the comfort of your own home. How to Use: 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 gray hairs, 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).