Questions specifically about the expected shelf life of a food item.

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Bottling cream-based salad dressing. Preservative advice?

I would like to bottle my home made salad dressing that is mayo- and cream-based. I was wondering what kind of preservatives I could use to lengthen shelf life. Also, I am using garlic powder as an ...
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Are bunya-bunya nuts safe to eat if the shells are moldy?

We recently harvested a bunch of bunya-bunya cones and set them aside for a while to wait for them to split open. Unfortunately, we forgot about them for a while and it rained in the meantime, so not ...
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what is canned flour's shelf life?

So, I have canned flour from 1991. It's been airtight and in our food storage. There is no bugs and it smells fine, is it good to use?