So in reading up on aging, I found the following from G.L. Pease:
"Q: What's the best way to store tobacco for aging?A: Ideally, tobacco should be left in its original sealed tin, and stored in a cool, dry place. It's important to realize that storage in plastic bags and the like, while allowing the tobacco to "meld," will prevent the true aging process. Plastic bags are permeable to small molecules. (Water, while not a very large molecule, is polarized, and has a hard time penetrating the barrier formed by the plastic.) If you can smell the contents through the bag, you're losing flavor and aroma! Mason jars, bail-top jars and so on are good candidates for long term storage, as long as you can resist the urge to open them to "check up" on what's happening. Aging tobacco must be left alone, with no gas exchange allowed. Once an aged tin is open, the contents should either be smoked relatively quickly, or transferred to a jar with a good seal."
The part that I don't quite understand is the italicized/underlined portion, especially as it applies to tins. Every tin I've purchased, even though it is tightly sealed, I can smell the tobacco at the seam of the lid and the tin body. Does this mean that the seal is bad, is it normal, or is it just ghosting from the tin sitting in a tobacco shop for who knows how long?
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Question about Aging in Tins