I seem to recall that "curing" bacon/ham, pickling vegetables and making jam were intended to preserve the food so treated, so why now do so many of these items need comparatively short sell/use by dates, and just how much accuracy is there in these dates and the use within x days of opening?
Similar with tinned foods, who and what determine usable periods? Have canning methods changed for the worse over the years?
In my usual grumpy old fart mode I often wonder if it is more a case of "convince the consumer to chuck it away and buy some more", nowadays re-inforced by the "claim damages" culture.
I remember my mother spooning the occasional bit of mould off the top of a pot of home made jam (she made dozens of pounds each year) and we ate the rest of it with no adverse consequences, similar with cheese, take a slice off all round if/when mould appeared. The looks and smell were the main indicators of not usable.
Catering for one it's not easy sometimes to consume a tin or jar of something within the quoted period so it gets wasted, or you buy the smaller sizes and pay nearly as much, e,g a small tin for 35 and a tin twice the size for 40.


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