Sastty Japan Rishiri Gray Hair Hidden Color – Black is a hair color that is designed specifically to cover gray hair. Its advanced formula is designed to provide superior coverage and vibrant color to your hair. This unique black color is ideal for those who want to keep their gray hair hidden while still having a natural look. The color is easy to apply and long-lasting, so you can enjoy perfect coverage and a natural-looking finish for up to 8 weeks. Its natural ingredients help nourish and protect your hair so that you can have the beautiful color you desire.