July 28, 2011   Decimated copper supply lifts China cupric sulphate prices   An eFeedLink Exclusive     Prices were stable to higher.   Transacted prices of sulphate feed additives in China Variety Price as of Jul 5 (RMB/tonne) Price as of  Jul 21 (RMB/tonne) Price change (RMB/tonne) Cupric sulphate 15,500-15,800 16,20 ...