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Suppose I was to cook some fish bones and make them soft. If I wanted to use them in the future what would be the best way to store them? Do I freeze it in which case after defrosting wouldn't it still be soft? Is there any point leaving it in the fridge or are they something that can be left at room temperature indefinately? Also how long would they last for using the different methods?

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    What do you want to use them for? What would have been done to the bones to prepare them for this usage? – Catija Nov 17 '16 at 4:50
  • they would have been poached or fried. basically i can't poach/fry them daily hence i just want to use them as an alternative to calcium supplements. – James Wilson Nov 22 '16 at 19:12
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If you produce edible food, it cannot be left at room temperature indefinitely. The bones in ossuaries are not cooked, softened fish bones, they are only the mineral part of animal bones, with the organic part decayed away. So there is no comparison there. Treat them like any other cooked food.

There is nothing which gets firm after going through the freezer, stuff gets mushier if anything. For bones, there shouldn't be any change in texture.

So the standard storage lifetime applies to them, just as for any other cooked meal: 2 hours outside, 3-5 days in the fridge, as long as you want in a -18 C freezer.

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