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The can is lined with plastic or resin on the inside that you are burning off and it's leeching into the food.
sohi-
Actually not likely. The cans are heat treated to kill off the bacteria and those coatings withstand much higher temp than you would likely get out of a small flame. It is all food safe coatings to begin with. So the standards are pretty high.
source: OH who did food tech as undergrad engineering and did internships working at multiple food packaging and canning facilities.
Although happy to look at anything you have that contradicts that.
Aroogah
Sorry. Where was the toxic coating?