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Chopsticks may bring to mind delicious Chinese dishes, hard-to-use tableware, or ravaged forests. However, the dinnerware now represents something far more sinister for Chinese Internet users: terrible toxins.

On Sunday, actor Huang Bo posted a message on his micro blog saying that when he tried to wash the disposable chopsticks from a restaurant, he was astonished to find that the chopsticks turned the water yellow and gave off a pungent smell.

"Stop using disposable chopsticks, it is not about saving the environment anymore, it is about saving your life," Huang wrote on the micro blog.

The message was forwarded 125,000 times.

Angry users asked Huang to reveal the name of the restaurant, and Huang said the bad chopsticks are not only provided in that one restaurant, but are widely distributed.

Dong Jinshi, secretary-general of the International Food Packaging Association, said the color and smell of the chopsticks may indicate that they were exposed to sulphur and other chemical substances.

"Sulphur, hydrogen peroxide, sodium sulfite and mold inhibitor are chemical substances commonly used to make disposable chopsticks, even though they are not allowed," Dong said.

China enacted a national standard on disposable chopsticks in 2010. It included specific criteria on additional chemical agents and the amounts allowed to produce chopsticks.

"For example, the standard says food-grade sulphur can be used in the production of bamboo chopsticks, while the sulfur dioxide residue should be controlled under 600 milligrams in one kilogram of chopsticks. But sulphur is not supposed to be used for wooden chopsticks," Dong said.

However, the standard has never been thoroughly enforced, Dong said.

"There is not even a specific government department in charge of the quality control," he said.

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 monitor 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.

（中國日報網英語點津 Helen 編輯）

About the broadcaster:

Nelly Min is an editor at China Daily with more than 10 years of experience as a newspaper editor and photographer. She has worked at major newspapers in the U.S., including the Los Angeles Times and the Detroit Free Press. She is also fluent in Korean.