Bigen permanent powder coloring 6 g Bigen permanent coloring is ammonia-free and does not require hydrogen peroxide. It colors your hair without stripping it (lightening) and with less damage than other traditional hair dyes with similar effects. It's a sweet choice. Bigen permanent powder coloring is ideal for all gray or partially gray hair. Without ammonia. No hydrogen peroxide. Easy to use (just mix with water). Very gentle on hair (low pH). Long-lasting, with beautiful, true-to-life colors. No strong odors. Gives hair a smooth, rich and natural look.