Unlined copper bowls?

Hi Amanda!!!!!! <3
the bowls are vintage, dug out of the back of the family pantry. They just don't look lined at all, but granted they're also pretty tarnished. I will try to clean them up and get a photo!

If it was lined with another metal, such as nickel, it would be pretty obvious. If it's tarnished, it's surely not lacquered either. Most danger associated with copper involves cooking acidic foods, and the danger of that is generally less than people think. Interestingly, jams are often cooked in copper- something in the fruit keeps it from reacting in the usual way. Short of cooking up batches of tomato sauce on a regular basis or something of the sort you are highly unlikely to suffer any harm from the copper, but you should certainly err on the side of caution.