and why you should never cook in them.
This is some really cool information.
Both articles explain why the insides of ALL food cans are coated, both
Aluminum and Steel:
http://www.nd.edu/~ndmag/can1su00.htm
Money quote:
"To keep powdered metal out of a can's contents, Schmid says,
manufacturers spray-coat the inside with a polymer dissolved in a
solvent. When the can is heated, the solvent boils away, leaving only
the protective polymer coating.
The coating not only plasters any microscopic debris to the can wall and
away from the food, it keeps the food from interacting with can
material, an especially important consideration with steel cans.
"Say you've got tomato soup in this steel can. You don't want that
acidic soup corroding your can. It would kill your can, and the can
would adulterate your food," Schmid says. "It's also why you're advised
that when you go camping and you have Spaghettios you don't cook them in
the can, because the polymer will degrade and you're going to be eating
polymer." (Industry sources tell Schmid that the typical consequences of
such a culinary blunder are headaches and constipation.)"
http://www.aluminum.org/Template.cfm?Section=Can&NavMenuID=289
Money quote:
"8. Inside Spraying
A specially selected coating is sprayed on the inside of the cans.
9. Baking
Cans are conveyed through a tunnel oven that bakes and cures the inside
coating."
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