LeFranc Burnishing Clay - Black Pre-mixed Clay - 1 Liter Professional-grade French burnishing clay formulated for traditional water gilding. This pre-mixed black bole creates an exceptional, smooth surface ideal for applying gold leaf and other precious metals. The clay arrives ready to use, simply combine with rabbit skin glue or hide glue before application. Designed for gilders and restoration specialists who demand authentic materials and superior results. One liter container.