Is it? I am talking about metal poisoning not the explosion risk, will the can leak dangerous metals into the dulche de leche product when boiled or is it safe to eat? (I am hoping it is because it is very convenient but if its not what to do safety first)

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    I have done it several times, since that is what my recipe for banoffee pie calls for to make the toffee. I am however not a chemist :) – Evpok Jul 5 '18 at 19:59

Yes, it is perfectly safe. Nearly all if not all canned foods sold commercially have been processed in retorts (industrial pressure cookers) to kill microrganisms The metal from the can is not going to leach into the food contained in it

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    It's perfectly safe as long as the can doesn't explode. You can avoid this by ensuring that the can stays completely submerged the whole time, or by opening the can and leaving the open end exposed to the air. Based on a quick scan of Google search results, the closed can method seems to be a lot more popular. – mrog Jul 5 '18 at 19:28
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    While many (if not most) commercially canned goods are pressure cooked, sweetened condensed milk apparently isn't. See, e.g., dairyprocessinghandbook.com/chapter/condensed-milk – derobert Jul 5 '18 at 22:01
  • @derobert but is it still safe? – Moe Epo Jul 6 '18 at 8:24
  • @MoeEpo I don't know. I'd guess yes (I doubt any dangerous metals are used in the can, and none melt at so low a temperature). I'd be more worried about plastics/etc. used in it, though I suspect they're fine at boiling, but have no actual evidence to point to. – derobert Jul 6 '18 at 11:10
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    Many cans are lined with plastic or epoxy. stevespanglerscience.com/lab/experiments/can-ripper mnn.com/food/healthy-eating/blogs/… – infogizmo Jul 6 '18 at 12:53

I don’t mean this in a snarky way, but what’s wrong with just dumping it into a pan, double boiler maybe? I know you have then created one more dirty dish but that eliminates the possibility of any off tastes or metallic tang in the milk.

  • Yes with suitable pan this is the best choice with that I agree with you. – Moe Epo Jul 7 '18 at 16:49

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