Just wondering about the aluminum as I have never had the problem at home either.
The only place I saw it was at work with big trays of boiled and fried shrimp.
I will eat a lot of stuff but I wont eat shrimp with an aluminum oxidized coating on it.
I was friends with the head chef and lead cook and I told them about it.
They cant watch everything thanked me and the problem stopped.
They put on a layer of plastic then the foil from then on.
Speaking of dehydrating those guys gave me a bag of dried she-talky mushrooms the size of a big grocery bag.
Worth