Gray Target Technology targets only the gray hair and replaces it with subtle tones that match your natural haircolor. The vitamin-enriched formula rejuvenates hair, leaving hair thicker and fuller-looking. Ammonia-free formula: wont damage hair. Easy as shampooing: no-drip formula works in 5 easy minutes. One application lasts up to 6 weeks: lasts until the gray grows back. Contains: Haircolor; Color developer.