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It's actually a one-way valve & it's critical to the shelf life of the coffee and the preservation of the bag itself. When coffee is fresh roasted, it releases carbon dioxide. It's basically a by-product of the roasting process. When the coffee is ground, carbon dioxide is released expeditiously. If you simply place fresh roasted coffee in a completely ...


Caffeine has a very very low vapor pressure 9.0X10-7 mm Hg at 25 deg C. Source Almost none would evaporate.


It is important to have in mind that altitude is not the only feature that allows one to differentiate the coffee beans. Temperature is perhaps even more important (altitude influences in the temperatures suffered by a coffee plant, but not all the same altitudes mean the same temperature profiles). As a brief summary (taken from [1]), we can say that: ...


Its nothing but a marketing gimmick, enabling the user to use the degassing ventilation hole as aroma hole. If the coffee is super fresh you will be smelling a very bad gas while squeezing the coffee bag, but this is rarely the case as many consumer coffee products have been laying in the shelfs for more than one week.


Beans can smell like dirt, especially if they are beans that are known for having an earthy flavor profile. What you want to avoid are rancid smelling beans that can get that way due to the oils being over-oxidized over time. Alway check the roasted-on date and don't drink coffee that is several months old. If the bag has an expiration date instead of a ...


Though I can't find any recent evidence, it seems that research at one time shows that caffeine can be used as an insecticide. However, due to the fact that natural light exposure degrades caffeine, it probably wouldn't make for a very good long-term solution.


Instant coffee is not generally considered to be the epitome of great tasting, or smelling coffee. It's almost the antithesis of artisanal whole bean arabica coffee. The iconic and appealing smell of freshly roasted or brewing coffee is due to arabica coffee. Instant coffee though is mostly, and often completely, made from lower cost robusta beans. Robusta ...


It could be a combination of things. I often notice a "fishy" smell from any coffee I consider roasted too dark. While the taste is generally fine, I find the smell off putting and it is one of the reasons I tend not to drink darkly roasted coffee. It's possible that the particular roast and beans the manufacturer is using just has an unusual smell ...


I use Maxwell House instant coffee. It is freeze dried, which adds nothing to the coffee. I have an acute sense of smell, yet, I've never noticed an odd smell from the Maxwell House, only, a lack of smell. Then upon further examination, discovered the jar was near it's expiration date. My theory is, that since your group opened it and all noted the "soy" ...

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