Recently, the police in various places have repeatedly seized the extremely serious cases of manufacturing and selling toxic beancurd. In the process of manufacturing and selling sufu, the manufacturers illegally used toxic and harmful additives such as hanging white block, borax and Urotropine in order to increase the weight, bleach, prevent corrosion and enhance the toughness of Yuba. Sodium bisulfite (sodium bisulfite), borax and Urotropine, as well as the limited food additive sodium metabisulfite, etc., are listed in the list of non edible substances that may be added by health and Family Planning Commission (nhfph [2014] No. 843) issued by the general office of the health and Family Planning Commission, and they are prohibited non edible substances. Long term consumption of these toxic additives will seriously damage human lungs, liver and kidney.

The standards for Yuba products are often found in local landmarks and technical specifications, such as DBS 45 / 005-2013, DB 52 / 519-2007, DB 45 / 320-2006, szjg 21.6-2006, DB 36 / T 531-2008, DB 37 / T 773-2007, etc. Among them, the technical requirements should meet the provisions of sensory, physical and chemical indicators and microbial indicators in DB 45 / 320-2006, and the types and amount of food additives used in the production process should strictly comply with the provisions of GB 2760.