부천 여월동 적황토를 이용한 옹기유의 발색과 적용

Abstract

The objectives of this study were to evaluate the coloration of Onggi glazes using Bucheon Yeowoldong lateritic soil and facilitate professionalism in Onggi museum educational work for ceramic class by using local raw materials. XRF analysis was conducted on laterite excavated from Bucheon Yeowoldong, where Onggi kiln site was located during the late Joseon dynasty. Yeowoldong Onggi glazes was developed by using lateritic soil from three locations (i.e., Bulgun Mountain, Bonghwang Valley, and Saebunduki) in Yeowoldong. Feldspar and lateritic soil were used as initial ingredient and tree ash (i.e., oak ash, pine ash, and bean pod ash) was used for fluxes. Following the traditional Onggi glazes manufacturing method, only lateritic soil and tree ash were glazed on Onggi clay and it went under oxidation firing at 1220℃. Feldspar was added and three materials were mixed. The mixture glazed Onggi clay and Porcelain body then it went through oxidation and reduction firing at 1230℃. XRF analysis results on Bucheon Yeowoldong lateritic soil showed that Bonghwang Valley had the highest alkali content (K2O/CaO), which influences melting of glaze. When Onggi clay was fired with only using Bucheon lateritic soil and treeash, overall glaze appearances were yellowish brown color under oxidation firing and between dark brown and greenish brown color under reduction firing. Glaze appearance was stable when the ratio between lateritic soil and tree ash was in the range of 7:3, 6:4, and 5:5. When feldspar, Yeowoldong lateritic soil, and tree ash were mixed and glazed on porcelain body, firing created clean and clear glaze appearances. Oxidation firing produced glossy color between yellowish brown and dark brown. yelloish celadon glaze, honey glaze, and soba glaze were observed. Beautiful iron glazes including favorable celadon glaze, deep green glaze, kaki glaze, iron sand glaze, tenmoku glaze, and red iron glazes were numerously observed with reduction firing.