Why is gum rosin ester allowed for poultry depilation while industrial rosin is banned?

Why is gum rosin ester allowed for poultry depilation while industrial rosin is banned?
China's regulatory framework draws a hard line between food-grade gum rosin ester and industrial rosin in poultry processing. Under GB2760-2014 and NY467-2001, gum rosin ester (CAS 8016-36-2) is explicitly permitted as a depilatory agent for livestock and poultry hair removal. Industrial rosin, however, is not on the approved list and its use in meat processing constitutes a violation of the Food Safety Law, carrying penalties under Article 123. The distinction matters commercially: food-grade gum rosin ester commands a regulatory premium, while industrial-grade material faces severe legal risk if diverted into food applications. Buyers should verify certification and traceability to avoid liability, as repeated heating of rosin-based agents can introduce heavy metal contamination, particularly lead, and oxidized rosin peroxides may harm liver and kidney function.