Using a mortar and pestle, a composition of glass, water and metal oxides is ground for hours by hand. When settled, the water is removed, leaving the fine paste that is the basis for hard enamel. A quill is then used to apply each coat of the mixture to the surface of the metal, ensuring that the entire guilloché area is completely covered in enamel. The components are then fired in a furnace at temperatures exceeding 1,000° F, fusing the enamel to the metal and forming a layer of glass.
After cooling, the pieces are manually ground with a diamond file, restoring their proper shape and surface. This tedious process is repeated at length until the level of enamel reaches the depth required to cover the peaks and fill the valleys of each intricate guilloché pattern. When the final stages of firing are completed, the pieces are polished and buffed, revealing the velvet finish of translucent hard enamel.