The Black Velvet series watercolor brush by Silver Brush LTD is made with a blend of natural squirrel hair and black synthetics that allows the brush to hold a huge amount of color and release it with perfect control for watercolors, gouache, liquid acrylics, inks and dyes. The bristles are soft enough to allow multiple-layer glazing without disturbing previous colors, yet firm enough to lift color with a gentle scrub. This is one of our most popular watercolor brushes. Watercolor artists love them!