Bigen Speedy Hair Color Conditioner in Natural Black (No.881) is a quick-acting hair dye that darkens gray hair in just 5 minutes. Formulated with natural herbs, it conditions while coloring for healthier-looking results. This is a personal care product containing hair dye. Please perform a patch test 48 hours before use to check for any allergic reactions. Results may vary depending on original hair color and condition. Follow package instructions carefully for best results.