In regards storing your opened can of concentrate, I would freeze it. Dump the remains into a Tupperware or other freezer-safe storage container and stick it in your freezer. The high sugar content might actually prevent all of the liquid from freezing, but the cold temperatures will halt any chemical reactions or microbial growth that could degrade the concentrate. Try to use it within six months if you can, just to be sure the quality of those delicate aromatic compounds remains intact.
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