Caustic soda, namely sodium hydroxide, is a highly corrosive high-risk chemical  However, caustic soda is also a processing aid that can be used in all kinds of food processing, and the residue does not need to be limited  It is an efficient acidity regulator  However, caustic soda used for food processing needs to be food grade, and many reports mention that illegal vendors use industrial caustic soda  The difference between food grade caustic soda and industrial caustic soda lies not in the main components, but in that the former has monitoring requirements for heavy metal impurities, while the latter does not  In fact, the risk of using sodium hydroxide in food is borne by the staff  In the final food, their corrosivity has long disappeared
The main components of food grade caustic soda and industrial caustic soda are basically the same, and can be used as acidity regulator.
 As for the use of industrial caustic soda, it belongs to the use of unqualified raw materials and should be cracked down