Shanxi

Next time you reach for some vinegar in which to dip that dumpling, consider this: The China Radio International (via China Daily) recently reported that "industry insiders" are raising concerns "that some businesses make vinegar by using excessive chemicals, even including a form of glacial acetic acid meant only for industrial use."

China has a national standard for blended vinegar that sets a maximum of 50 percent glacial acetic acid. However, both insiders contacted by China Daily said that it is virtually impossible to detect whether producers have added industrial acetic acid, and how much, creating a loophole for lawbreakers.

• Read more