Drums which stored chemicals used to make woks

Drums which stored chemicals used to make woks
http://www.shanghaidaily.com/nsp/National/2013/01/14/Drums%2Bwhich%2Bstored%2Bchemicals%2Bused%2Bto%2Bmake%2Bwoks/

"THOUSANDS of woks, the most common cooking tool in China, are made from illegally recycled iron drums that once held toxic chemicals, in small workshops in Jiangxi Province, China Central Television reported."