The curve of the DAX index board is pictured at Frankfurt’s stock exchange

The curve of the DAX index board is pictured at Frankfurt’s stock exchange September 13, 2011. European shares turned negative on Tuesday, with banks that had risen sharply in early trade on hopes China would buy into Italian debt giving up gains, as traders said it was not a long-term solution for the euro zone debt crisis. REUTERS/Remote/Pawel Kopczynski (GERMANY – Tags: BUSINESS)