Factories in Nanchang county in Jiangxi were the main source of "the toxic preserved eggsincident" and 30 companies have been closed by authorities since the discovery. Other factories are still undergoing investigation.
Preserved 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.
TracyJunli
