"using an underglaze of 3–4 parts Gerstley borate to one part Mason stain by volume. This recipe is really more commonly used as an overglaze, but it works fine on leather-hard pots as well. Because there is no clay or opacifier added, the color is more intense than in a traditional underglaze or slip."
slightly wet the back of each stencil and stick to leather hard clay. cover the entire surface with a thick slip. Allow the slip and the clay surface to equalize in water content (wait for the surface to lose its sheen) then peel back the edge of template to reveal the resisted pattern.