Worked leather is a type of leather that has been treated with tools and TANNED. It is created by using tools to shape the leather into a desired pattern, and then treating it with tannins to preserve it. The process of tooling leather involves pressing tools into the leather to create a design, while tannins are used to give the leather a darker color and make it more durable. The combination of these two processes creates a unique and beautiful material that can be used for a variety of purposes.