Bigen Men's Beard Color in Dark Brown (B103) is a popular choice for men looking for a natural, ammonia-free solution to cover gray facial hair. Unlike some liquid dyes, this is a high-viscosity cream designed to stay on the hair without dripping or staining the skin, Dark Brown (B103) ideal for hair that is naturally dark but not quite black, f your hair is naturally a lighter brown, Dark Brown may look very dark (almost black) if left on for the full 10 minutes. You might want to test a small section for 5–7 minutes first.