Nanogen Aquamatch Black helps to blend your hair with your scalp, concealing areas of thinning or baldness. The waterproof pencil can either be used by itself, or as a base underneath Nanogen Hair Fibres. Dermatologically tested, the gentle formula can be used on daily basis to keep your hair looking consistently full and thick, as it simply washes out when you shower. Directions of Use: Apply a few strokes of Aquamatch directly to your scalp and blend with your fingertips to make the edges more subtle.