It is typically recovered in the form of small, thick chunks.Surface treatments centered on lead glazes, both clear and colored.
The fabric of faience is soft and typically pale yellow to salmon in color, sometimes even in single vessel (Gums 199).
The vitrification process involves the temperature and conditions under which the particles of clay fuse.
The high temperature has the effect of changing the physical properties of the clay so that it, for instance, will not dissolve to mud when exposed to water.
It was produced at many places throughout the state and region and was often the object of cottage industry.
One important manufacturer was located in Galena, Illinois.