Bigen Permanent Hair Dye Bigen produces optimum darkening results regardless of your natural hair color, consistency, condition, length or style. Color results may vary depending on original hair color and texture. This product is designed to cover grays. It will not lighten hair. Contains no ammonia and requires no peroxide Gives beautiful, true-to-life, long-lasting color Provides a rich and natural look Economical way to color your hair No heavy masking odor Easy application