Investigation of the leadless majolica (700-1000C) glazes covered three systematic fields of studies of composition of borosilicate opaque fritted glazes. The studies were made to ascertain the effects of variation in the fluxes of Ca, Mg, Sr and Zn oxides, and in alumina and alumina-silica ratio. Glazes were applied on low talc bodies, and autoclaved at 100 psi. A number of glaze compositions were obtained giving white colour, excellent gloss and opacity.