In the latest food scandal to hit China, manufacturers were found to have sped up production of thousand year eggs with a dangerous chemical, according to the SCMP.
Factories in Nanchang county in Jiangxi were the main source of the problem and 30 companies have been closed by authorities since the discovery. Other factories are still undergoing investigation.
Thousand year old eggs generally take about two months to create, using baking soda, salt, and quicklime.
The plants were guilty of adding industrial copper sulphate to the eggs to speed up the production schedule, halving the time to a month.
According to SCMP, industrial copper sulphate usually contains high levels of toxic heavy metals, including arsenic, lead and cadmium, all destructive to the body.
The scandal was discovered by the media, and not the authorities themselves.
According to Xinhua, the Chinese State Food and Drug Administration is now requiring “industrial and commercial administrative departments, quality supervision departments as well as food and drug administrative departments nationwide to supervise and examine all producers” of the preserved eggs.
Last month, Guangzhou rice was found to contain cadmium.
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