Occasionally, I go camping and cook beans over a fire inside of the [what I am assuming is tin] can it comes packaged in (after opening the lid). Does heating the metal can release any chemicals in the food? Is it safe?
I usually have the top of the can open and stir it frequently.
Steel cans might release trace amounts of chromium and nickel when heated but aluminum leaches much more easily, according to Scientific American Magazine. Aluminum is linked to significant health problems, including disorders of the nervous system.
The linings that coat most cans of either type may contain BPA, a chemical linked to cancer and reproductive diseases.
Be especially aware of cans with plastic liners. Remember it's plastic, chances are it will melt off into your food. It's a wiser practice to first burn out the can, i.e. Roast it in or over a fire to melt/ burn any undesirable chemicals/ plastics before you use it. After doing so wash it out and you're good to go.
googled and found some people warns about not scrubbing away the liner or whatever the plastic is in some or many of the cans. found out a company that sells cans and they said like scientists has researched and found it BPA is the safest way for food storage so well...
i say burn it. the last thing we would want in our bodies is BPA. burning is probably way easier and goes with less little time also than scrubbing. plus you already have the fire going so whats the problem.
i would probably take with me some sandpaper and scrubb it also. perhaps some of the chromium and other stuff that makes the steel looks shiny and sweet goes away then too.