HEALTH & BEAUTY HAIR COLOR & DEVELOPER REVLON Weight: REVLON HAIR COLOR SILK 31 DARK BROWN is a permanent hair color that provides dark brown pigment with a silk finish. The unique formula creates beautiful, natural-looking results that are safe for all hair types. With Silk 31, you can achieve the perfect shade without harsh chemicals or ammonia. Revlon has revolutionized hair coloring with its 31 Dark Brown colors. This revolutionary product provides salon-quality results in just one step, using Revlons exclusive Silk Technology. With no ammonia or peroxide, this color is gentle on your hair and wont leave it feeling dry or brittle. Plus, the formula lasts up to 4 weeks, so you can enjoy long-lasting results without having to reapply every day.