Shanxi mature vinegar still made the old way

Copper finger caps are used during the brewing process at Baoyuan Vinegar Workshop in Qingxu county, North China's Shanxi province, Sept 5, 2013. [Photo by Guo Rong/chinadaily.com.cn]

The smoking fermentation section of Baoyuan Vinegar Workshop in Qingxu county, North China's Shanxi province, Sept 5, 2013. [Photo by Guo Rong/chinadaily.com.cn]