The Taichung City Health Bureau carried out tests at traditional markets, grocery stores, and department stores of products commonly used in popiah (rùnbǐng spring rolls 潤餅), which is a popular dish for Qingming (Tomb Sweeping Day), Apple Daily reported.
Health officials noted that tests found excessive levels of hydrogen peroxide in many tofu products. Many of the products were sold at Shengang stores (神岡百貨) and have already been consumed.
Hydrogen peroxide is sometimes used in tofu production as a fungicide. However, traces of the chemical are usually not found on products sold. If more than trace amounts are consumed, the Health Bureau warned, it may cause nausea, vomiting, and other symptoms and health complications.
Authorities are tracking upstream companies to prevent tainted products from entering the grocery supply chain.