A minor panic broke out when Iowa banned restaurants and bars from using copper mugs due to safety concerns.
The FDA guidelines say that copper shouldn't come to contact with foods that have a pH below 6.0. The pH of Moscow Mules is well below 6.0, but the copper mugs that are usually served with the drink are lined with tin or stainless steel.
So they're safe to drink from. Enjoy your Moscow Mule with a peace of mind! Read more...More about Food, Health, Beverage, Alcohol, and Drink