Special cold noodles produced by Fushun Hanshang Food Co., Ltd. and sold by the Xinyuou Food Wholesale Department of Shenyang Economic and Technological Development Zone, (Han Diyuan graphic), the dehydroacetic acid and its sodium salt content is 0.319g/kg , does not meet the standard regulations that cannot be used, and the product is unqualified. Dehydroacetic acid and its sodium salt are widely used as food additives as preservatives and have a strong inhibitory effect on mold. However, dehydroacetic acid and its sodium salt can be quickly and completely absorbed by human tissues. After entering the human body, they are dispersed in the plasma and many organs, and have the effect of inhibiting various oxidative enzymes in the body. However, relevant food safety regulations prohibit the detection of special cold noodles, which means they must not be used.