Underglaze Testing in Soda and Reduction Kiln

Abstract

The purpose of this research projects is to examine how Amaco underglazes react in a high fired kiln. The study was conducted by firing 58 Amaco underglazes colors on ceramic test tiles at cone 10 in two types of kilns. A soda kiln and a reduction kiln were used to conduct the experiment. Each underglaze color had eight ceramic test tiles that were divided between two kilns with 2 tiles having just underglaze, and 2 tiles with underglaze and clear coat. The research shows that the Amaco colors react best in the reduction kiln with a clear coat glaze on top. Most of the colors in the soda kiln with and without the clear glaze became muddy and darkened.