The early products and solutions have been just dried from the Sunlight or fired at lower temperature (under one,000°C) in rudimentary kilns dug into the ground. Pottery was both monochrome or decorated by painting uncomplicated linear or geometric motifs. Widespread red clay and shale clay have vegetable and ferric oxide http://ceramicjarswithcorklids21097.izrablog.com/12183698/ceramic-jars-an-overview