Wella Koleston Supreme Hair Color Kit 1/0 Darkest Night Black is a high-quality permanent hair dye that delivers intense, deep black color while nourishing and protecting the hair. The 1/0 Darkest Night Black shade offers a rich, jet-black color with a cool, dark finish, ideal for those seeking an intense, dramatic look with a sleek, shiny finish. This formula provides long-lasting results, full gray coverage, and helps keep hair looking healthy and vibrant.