Scratchbord Fiber Brush - Use the scratchboard fiber brush tool like an eraser to soften crisp edges and to create gradual tonal values. Use a soft brush to remove the erasure dust instead of your hand because the fiberglass fibers can cause skin irritation. Note - Contains fiberglass, not recommended for children. Ampersand Scratchbord tools allow artists and hobbyists to render fine details and unique textures on Claybord, Scratchbord, and other art boards and papers. Unleash your inner artist by experimenting with each of them to see just how creative you can be when drawing with light on dark.