Revlon ColorSilk 51 Light Brown Hair DyeRevlon ColorSilk 51 Light Brown Permanent Ammonia Free Hair Dye Revlon ColorSilk 51 Light Brown is a permanent hair color that gives you a rich, cool neutral light brown result shade 51 is distinct from warm golden shades, delivering a natural, ashy tone that suits a wide range of skin tones. Powered by Revlon's 3D Color Gel Technology and enriched with silk proteins, it colors every strand evenly while conditioning your hair throughout the process.