The single-firing process (as opposed to Bicottura which fires twice or more times) of making tile from terra cotta clay and firing it high enough to achieve a strong and dense product. Normally and engobe layer is applied over the body and glaze over that. The technique requires considerable expertise to develop a strong fired product (by virtue of crystal development in the matrix) and deal with the physical and thermal expansion matching of engobe and glaze to the body (and each other).
Monoporosa or Single Fired Wall Tiles
A history, technical description of the process and body and glaze materials overview of the monoporosa single fire glazed wall tile process from the man who invented it.