Note 26 — I. TECHNICAL PROCESSES IN THE MAKING OF MODERN POTTERY AND THEIR APPLICATION TO THE TECHNIQUE OF ANCIENT VASES

It is sometimes assumed that the accessory colors—purple and white—were not fired and that this is the reason why they are less well preserved and dull instead of shiny like the black glaze. That they were fired is shown by the discoloration of the black glaze beneath the white or purple. They are neither shiny nor durable for the simple reason that they are not a glaze but earth colors.