food safety - tins which are "blown"

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There was a thread back in 2006 about dented tins but that has been closed so I can't resurrect it. (I found it through a web search - not MSE search.)
I have a tin of salmon (bought within last couple of months and made April 2020 I think with expiry of April 2024) which doesn't have a dent that I can detect. However, when I press the ends the tin moves/gives a little. Other similar tins do not do that, even one with a slight dent.
So, is the first tin "blown" and the contents not safe to eat? If so, I'll return to the shop for a replacement.
I have a tin of salmon (bought within last couple of months and made April 2020 I think with expiry of April 2024) which doesn't have a dent that I can detect. However, when I press the ends the tin moves/gives a little. Other similar tins do not do that, even one with a slight dent.
So, is the first tin "blown" and the contents not safe to eat? If so, I'll return to the shop for a replacement.
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I picked up some sardines in sunflower oil the other week, first time Ive seen them in the shops for months so just grabbed 6 tins - 2 were blown
Im not sure, but I think if the tin has blown, it wasnt heated enough in production so air and therefore possible bugs can be in there multiplying like billy-O
But, to add, it is not "blown" in the sense of being convex, only that there is "give" when I press in.
Im not a Best Before person, Im using soy sauce thats over 30 years old ( its fermented after all ), but cans, no matter what the date on them, if they blow - they are gone
- Pip
mmm....my other half is saving these to eat lol (salmon)
returned the tin to the shop.
First found current shelved stock - some of which had a little "give".
Selected one which was solid and with no visible damage.
Asked to speak with a manager who appeared quite quickly.
Explained my dissatisfaction.
Exchange offered immediately, no request for till receipt which I did have with me.