The present invention relates to a Koryo celadon manufacturing technique including raw material soil mixing, moisturizing (purification), kneading, molding, drying, inlay, drying, biscuit firing, glazing, re-roasting, reduction firing, and finishing. According to the present invention, a first porcelain raw material is prepared by the quantitative-ratio mixing of 303 wt% of white clay, 202 wt% of potters clay, 202 wt% of Cheil clay, 202 wt% of porcelain clay, and 101 wt% of Muan clay and a glaze raw material is prepared by the mixing of 303 wt% of feldspar, 303 wt% of silica, 202 wt% of limestone, 101 wt% of pine ash, 80.5 wt% of kaolin, and 20.1 wt% of oxide iron. The first raw material is mixed at a quantitative ratio, is molded into a celadon model, is carved, and then an inlay process is executed. Then, drying is performed, biscuit firing is performed within a range of 90050 degrees Celsius and at a range of five days, gradual cooling is performed for two days, the glaze is applied, and re-roasting is performed within a temperature range of 1,000 to 1,250 degrees Celsius for three days on made fire, 41 days on soot fire, 51 days on white fire, and 51 days on red fire. In the end, re-roasting is performed for one day on melting fire within a range of 1,30010 degrees Celsius. After the re-roasting process is completed, an inlet portion of a kiln is blocked and a reduction firing process is performed in an oxygen-less airtight atmosphere for the celadon to be finished.
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