Finally, we apply the gold leaf to the frame. To do this, we brush water onto the surface. This rehydrates the rabbit skin glue in the bole. Then we use a specially-made brush, called a gilder’s tip, to pick up the gold leaf and gently set it onto the wet bole. As the bole dries, the rabbit skin glue permanently adheres the gold to the frame. In several hours, when the bole is almost dry, we rub the surface with an agate stone to burnish the gilding. The pressure from the agate compresses the surface of the bole “cushion” beneath the gold. The burnishing creates the exceptionally brilliant surface that sets water gilding apart from all other forms of gilding.