A box of Heinz AD Calcium Hi-Protein Cereal, which is part of a batch of the cereal not affected by a recent recall, is pictured at a supermarket in Hangzhou, Zhejiang province in this August 18, 2014 file photo. U.S. food maker H.J. Heinz Co. apologised to Chinese consumers and said it would tighten controls over suppliers after it was forced to recall some infant cereal from store shelves due to excess levels of lead. The entanglement of H.J. Heinz Co. in China's latest food scare highlights a key concern for international and local firms - how to keep track of ingredients from diverse sources in a country where food supply tracing technologies are far from the norm.   REUTERS/Stringer/Files (CHINA - Tags: HEALTH FOOD BUSINESS POLITICS) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
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