The surface is sometimes protected by a lead glaze—green, brown or yellow—but is generally left unglazed.
What we are trying earnestly to do is to find a substitute for lead glaze.
Fragments of a flowerpot have a body similar to the foregoing, but are lined with slip under a lead glaze.
After a partial firing, lead glaze was applied, and lustre pigments gave the ware the iridescence characteristic of real majolica.
Whether he used a plumbiferous, or lead glaze; or a stanniferous, or tin glaze, we do not know.