L Oreal Paris Magic Root Rescue Permanent Hair Color 4 Dark Brown L Oreal Paris Magic Root Rescue 4 Matches Dark Brown Shades Permanent Hair Color It Lasts up to 4 weeks. Until regrowth appears again. Fast - 100% gray coverage in just 10 minutes! Easy - Mix color from one easy-to-squeeze bottle. Customized - Choose from two applicator tips: Soft brush tip or precision tip. Mess-free - Apply color only where you need it. Find the perfect match for your color. Matches leading permanent at-home shades even salon color.