According to Dong, most chopsticks are made in small workshops in mountainous regions, where the companies do not need a production license. The chopsticks are then shipped to large cities for packaging.

"For example, there are seven or eight chopstick plants in Daxing district, Beijing, all in charge of packaging. Because the chopsticks go through so many intermediate sellers, even the chopstick plant owners cannot specify the origin of their products," Dong said.

In 2010, Chinese media exposed the chaotic management of chopstick production. The State Food and Drug Administration published a notice asking local administrations to strengthen investigations into chopstick quality.

However, the result of that investigation was not posted on the website of the administration, and chopstick quality was never again listed as an important inspection item in the following years.

"The standard stayed theoretical. It had never been put into use in reality," Dong said.

Fan Zhihong, a food safety expert at China Agricultural University, said it is still difficult to make a risk assessment on disposable chopsticks.

"There is no data showing the amount of chemical residue or the amount of chemicals that can be transferred to people using them, and there are no reports of individuals being poisoned by the chopsticks, so it is difficult to determine their influence on human health," Fan said.

Nevertheless, consumers are not patient enough to find out whether disposable chopsticks are dangerous or not.

On popular online marketplace Taobao, portable chopsticks have become a big seller.

"Our business is generally good, but in the past two days, sales were really good," said a storeowner on Taobao, who sold 1,880 pairs of chopsticks in the past month.

"On the homepage of our store, I posted a lot of information telling people that disposable chopsticks are not good, but nobody cared in the past. So I guess movie stars like Huang Bo have a real influence on people," the storeowner said.

[email protected]