Proto-porcelain material has been discovered dating back to the Neolithic period, with shards of material found in archaeological sites from the Eastern Han period in China. These wares are estimated to have been fired from 1260 °C to 1300 °C. In the 8th century, porcelain was invented in Tang dynasty, China. Porcelain in china resulted in a methodical development of widely used kilns that increased the quality and quantity that porcelain could be produced. Tin-glazing of ceramics is invented by Arabic chemists and potters in Basra, Iraq.