Metallic Colors Extraction Through Salt Glazes by Method

Abstract

Abstract

This study focused on the use of Trona and Kambo (compacted cane ash) from Nyala region in Sudan as sources of easily fusible mineral salt and their potential inclusion in glaze mixtures to address the lack of other suitable flux materials in Sudan's natural resources. The Malachite ore from Gebel Aryab on the Red Sea was also used as a source of copper compounds in order to benefit from its resultant colors after burning. The study also discusses the use of nepheline syenite from Gebel Al Dumbair and Diatomaceous earth from the village of Graygriba, south of Medani, together with Quartz from Northern Khartoum and wood ash, which are used to balance the mixtures and improve their fusing properties. The samples were prepared for analysis by grounding, XRF, EDS testing, sieving, and decalcification. Various glaze mixtures were assembled and applied to burned kaolin bodies and then burned to 1070˚C and left to cool to 1000˚C before undergoing the Raku process. The study proved that it is possible to obtain completely fused glaze layers using Trona and Kombo as fluxes while metallic and rainbow hues can be obtained through the use of Trona and Kombo alongside other materials, such as malachite.