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I opened a can of sliced black olives for my pizza and only used half. I put the leftovers into a sealed container with the liquid and put it in the fridge. Under those conditions how long will the olives last? Is there a better way to store leftover olives?

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Fun fact: ordinary supermarket canned "black" olives aren't really black olives. They're green olives that have been subjected to a chemical process that turns them black. Real black olives ripen to that color. (From McGee's On Food And Cooking) –  Pointy Jul 27 '10 at 16:17
    
Sometimes you will see slimy, moldy looking bits floating on top of the liquid. This is most likely not mold, but solidifying oil and the olives are still good. You can tell that it is not mold by seeing if it melts outside the fridge. –  user2215 Sep 28 '10 at 23:25

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Olives are basically cured in salt, so they will last a very long time. They will last even longer if kept in an air-sealed container in a refrigerator. They will last even longer than that if kept in a salty brine which covers them with liquid and minimizes exposure to air.

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I would drain them, put them in a glass jar and cover completely with olive oil. Maybe add some flavourings such as dried chilli or orange zest. Covered with oil in the fridge they should keep indefinitely.

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They should definitely be fine for at least a week when stored in the brine.

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You're a poet and you did not knowit. –  Jeff Axelrod Feb 3 '13 at 18:23

I haven't been able to get a good answer to this question either. I even emailed companies that can the olives - no response. I bet it's a really long time or they would tell me. They would just rather I buy a can every time I get a craving. I think I have eaten them after a week and been just fine.

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According to "Keeping Food Fresh" by Janet Bailey,

Unopened cans of olives keep up to one year on a cool, dry shelf. Once you have opened a can, store the olives completely submerged in their own liquid in a covered container in the refrigerator for one to two weeks. Olives bought in bulk and stored steeped in oil keep several months in the refrigerator. Discard olives that have turned soft.

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They'll last a good few weeks from my experience. There's no real rule though to predict how long they'll keep.

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If they are for cooking purposes, just drain, and freeze in portion sized bags.

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http://calolive.org/our-story/faqs/ California ripe olives says 10 days after they are opened and put in a airtight container.

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