R. L. Hobson, Chinese pottery and porcelain; vol… (1915)
“ The Sung is the age of high–fired glazes, splendid in their lavish richness and in the subtle and often unforeseen tints which emerge from their opalescent depths. It is also an age of bold, free potting, robust and virile forms, an age of pottery in its purest manifestation. Painted ornament was used at certain factories in black and coloured clays, and, it would seem, even in red and green enamels; but painted ornament was less esteemed than the true ceramic decoration obtained by carving, incising, and moulding—processes which the potters worked with the clay alone. ”
