I know the man from 'elf & safety stuck his oar in a few years ago & the green Swarfega can't be used in industry any more. Safe enough for 'Joe public' though it seems, unlike creosote :-(
If you look in your bathroom you'll find lots of little messages on products saying they have a shelf life of 12M.
This PAO (period after opening) is indicated within an open jar illustration that has a number inside followed by the letter M. For example, 12M corresponds to 12 months, that is, the product should be used within a year after opening.
If you're putting your fingers in it you'll be putting your skin cells and bacteria in there and they might grow. OR the product may deteriate upon opening and eventually breakdown. If it smells ok and doesn't burn your arm off it's probably ok though.
I wish I coudl persuade my wife to do that with the fod cupboard. There's a couple of tins of condensed milk in there that are 20 years past their "use by" date. If I throw them in the bin she retrieves them. I guess they'll become heirlooms.
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