Ancient decarburisation kiln discovered in central China

Archaeologists have discovered a decarburisation kiln dating back to the Warring States Period (475 B.C. - 221 B.C.) in the Houduanwan cast-iron relics site in Henan Province, the Chinese news agency Xinhua reported. The site, in the city of Xinzheng, was an official workshop for casting tools and wea...