I just got off the phone with SaraLee, the manufacturer of MJB coffee. They told me that the can is 100% steel. They said that the only down side of using the cans for food is that they would eventually rust. It is totally safe for food. (My cast iron cooking pots also rust.
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Cliff Harrison
PonderosaSports.com
Horseshoe Bend, ID
American Redoubt
N43.9668 W116.1888