![]() At this point, the unpainted zones of the vessel became red again while the vitrified slip (the painted areas) retained a glossy black hue. Finally, in the last stage, the vents were reopened and oxidizing conditions returned inside the kiln. Next, by sealing the vents and increasing temperature to around 900-950° centigrade, everything turned black and the areas painted with the slip vitrified (transformed into a glassy substance). At this point, the entire vase turned red in color. First, the temperature was stoked to about 800° centigrade and vents allowed for an oxidizing environment. ![]() Not only did the pots have to be stacked in the kiln in a specific manner, but the conditions inside had to be precise. ![]() To produce the characteristic red and black colors found on vases, Greek craftsmen used liquid clay as paint (termed “slip”) and perfected a complicated three-stage firing process.
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