On Sun, 23 Aug 2020 00:54:35 -0000 (UTC), Mike Duffy
> wrote:

>On Sat, 22 Aug 2020 18:18:16 -0600, U.S. Janet B. wrote:
>
>> The cans burst because the contents are spoiled.
>
>Yes, bad live bacteria can sometimes end up within cans and build up
>pressure; check lid & bottom for bulges.
>
>Also, check the metal top & bottom edges for rust. Sometimes a low
>cupboard might be cool enough to attract moisture and rust through a can
>in a few months. Expect spoilage; possibly toxic.
>
>
>I prefer canned white mushrooms over fresh simply because raw ones go bad
>fairly quickly if not cooked. Yes, the taste is a bit compromised, but
>that happens too if they are not cooked in a few days.

I think fresh white mushrooms improve with a bit of age, maybe because
they lose water. Of course, there's a limit to this.