This article in the Guardian newspaper gives some examples of where the determination of geological and ground water isotopes, and trace elements linked to the soil and geography where the food originates, is able to check claims of the origin of the food or crop. Examples are given about fraudulent claims of Egyptian cotton, New Zealand beef, and chocolate from beans sourced in Venezuela/Ivory Coast. It also describes the science behind identifying the country where "Adam" the torso of a young boy found in the water under Tower Bridge in London twenty years ago, spent his life before being taken to England.
Read the article here
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