Cabbage
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The hot summer months in China make the cabbage crops wilted and borderline inedible. So, in order to keep the cabbage looking fresh during these times, farmers may spray it with a formalin solution.
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While that does do the trick for the cabbage itself, this particular solution is harmful to humans consuming it down the line. The formalin is made up of formaldehyde and other chemicals used as disinfectants.
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