Wool smudge ball Brush leather dyeing tool DIY craft project dyeing 1. Sturdy bristle brush: The bristle brush's head is tightly tied together, which gives me plenty of opportunity to practice dyeing on small pieces to try to match the color of my new leather boots. The applicator brushes stay together, apply liquids well, and apply oils perfectly, even at high temperatures, without burning your fingers. 2. Versatile tools for all purposes: Our wool brushes are not limited to leather dyeing. It is also suitable for gluing, crafting and other DIY projects. 3. Very suitable for leather dyeing and other DIY craft projects. These wool smears are specially designed for the application of various oil-based or water-based dyes to leather products.