The Effects of Banana Ash, Vigan Clay, DT, and Other Oxides in Glazing Terra Cotta Vases

Abstract

This study was focused on determining the effects of banana ash (Ba), Wigan clay (), andDTmixed with cobalt oxide (CoO), iron oxide (FeO), and manganese dioxide (MnO2) in glazing terra cotta vases in terms of the appearance, texture, and color of the test pieces after firing at 1020°C. The results of this study showed that the formulations of banana ash, Wigan clay, and DT mixed with cobalt oxide except CI5 (35-15-75-5 BaVD + CoO) produced blue violet
and Victoria blue frited tile samples, with rough sufaces. Among the BaVD formulations with iron oxide, all the formulations except FI, F2, and F4 yielded test pieces that were rated gloss point in appearance and had smooth surfaces. Three colors were produced by the formulations of BaVD with iron oxide, namely: brow, spumako camel, and chocolate brown. All the the samples glazed with 16 BaVD formulations mixed with manganese dioxide were rated gloss point in appearance, had smooth surfaces, and two colors were produced, namely: cypress brown and spumako camel. Therefore, it was concluded that among 48 formulations of banana ash, Wigan clay, and DT, mixed wth these different oxides, the formulations mixed with manganese dioxide yielded the best results in glazing
terracotta vases.