Investigators found “abnormal” levels of lead in the blood of 233 children at Peixin Kindergarten in Tianshui city, according to state broadcaster CCTV.
Food safety scandals were once common in China, where tainted milk formula made hundreds of thousands of babies ill in 2008 and was linked to six deaths.
A parent told state-run Jimu News tabloid last week that children had been experiencing stomach pain and nausea, and that some of their teeth turned black.
The cake, served at breakfast, returned a reading of 1,052 milligrams per kilogram and the roll, served at another meal, was found with 1,340 milligrams per kilogram.
CCTV said security footage shows kitchen staff adding packaged yellow colouring to a flour mix used in both contaminated dishes.
Investigators found that Zhu and Li allowed kitchen staff to produce food using paint pigments purchased online that were later found to contain lead and were marked inedible.
Food safety standards have generally improved across China but revelations last year that cooking oil had been transported in containers also used to carry fuel sparked outrage across Chinese social media. – AFP
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