I am not sure it will keep for that long in dark cupboard, lots of mixed opinion's on on web,
cant afford a deep freezer etc. Some I read said dark place fine, others say must be in a freezer,
anyone know shelf life for sure if but in amber bottles and in dark cupboard.
May I suggest you visit @Rossum 's thread and look at the pictures of his experiments?
These are the oldest samples that from Wizard labs that I started this thread with. To jog people's memory, that was just a bit more than 6 moths ago.
Here they are with LED backlighting in the fridge:
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and on the usual white background with natural light:
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RT-room temp, F-freezer. A picture is worth a thousand words. Now, that brown oxidized nic won't kill you, but I always store my nic in glass in the freezer.