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You cannot usually substitute balsamic vinegar for cider vinegar. The flavor profiles are quite different. However the chemical properties are similar, so the actual answer depends on the particular situation.
no. it is a vinegar so it preserves itself
1 day
It doesn't.
it takes up to 5 to 7 days to turn rubbery.
yes egg shells can disintegrate in vinegar.
2-5 days
about 9 days
If they are an alloy, they will eventually rust.
About 2 to 3
wash them in vinegar to make them shine for a long time
yes