If you dry the tobacco you’re going to lose some of the curing residue in the process. Mold needs oxygen to form, this will be consumed by the anaerobic bacterium that forms, so if mold occurs it will be within a month, the seal is not tight, too much oxygen to start with or the seal is bad and letting oxygen in.
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From what I’ve gathered from G.L. Pease’s interviews, articles and my own knowledge of anaerobic bacteria this is the conclusion I’ve made on ageing not curing tobacco, which are two different things. To age at the best speed and result Jars should be packed with an air tight lid. If it’s a moist broken flake leave some room at the top, loose flake can just be stacked, you don’t want to crush those flake planks (I don’t). Ribbon cut you can smash as there’s enough room for oxygen. This allows for anaerobic bacteria to form and the ageing process to occur as the oxygen is depleted. If you open it, you allow oxygen in and then the process won’t start again until it’s depleted. The differences in quality of the ageing are at 1 month, 6 months, 1 year, and then it slows to 5 year increments.
So with this in mind a vacuumed sealed tin which has its oxygen removed will age, but slower as you need the oxygen for a greater amount of anaerobic bacteria to be present. So you’re better off taking the tins and putting them in jars for a faster ageing process. The plastic cap on a tin still allows oxygen to enter, so no ageing will take place.