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As per Kyle above, YEs coffees fresher to roasting are expelling more gas than older ones that have degassed more. indeed a definition of staleness may include no more CO2 is released. hitting beans with water shows that this gas is happening. But why bloom? that is supposed to get the gas out so water can come in. Does it? if so for how much of what's ...


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Bottom Line: When someone allows their coffee to bloom, they are pouring just enough hot water on the ground coffee to allow the gasses to be released but not so much that a lot of water starts dripping through. The presence of CO2 is indicative that the ground coffee is fresh. However, we do not actually want CO2 in the coffee we drink. Therefore, it is ...


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