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Test it first, but it should work fine Agar Agar powder has a pretty long shelf life, even decades expired agar still works fine. But if the container was opened it might have picked up some moisture from the air which will weaken how well it gels. It will be pretty obvious if you mix a test batch, just mix a bit in a paper cup and see if it gels. As long as ...


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Use science to figure it out! Order some new jugs. Tell the class about the old jugs you found. Make 2 batches of plates: old and new. Make dilutions of bacteria. Does the old agar support as many colonies as the new? Even better would be to have some other kinds of agar plates. You can have old and new. You can have agar with extra salt. You can have ...


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