What Is Coffee Bloom and Why Does It Matter?

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The bloom of coffee is when all of the gases that have been trapped inside the coffee bean start leaking ou...
The bloom of coffee is when all of the gases that have been trapped inside the coffee bean start leaking out. This process begins when hot water is introduced to the grind. Then the bean absorbs and expands and at the same time, pushes out all the CO2 trapped inside. Where does the CO2 come from? It happens during the roasting process. Dark roasts, for example, have more of a bloom, as they are roasted for longer and more CO2 gets trapped inside. This is how we can tell how fresh a bean is or how freshly roasted it is. The reason it matters is that there is a bunch of flavor in those gases, as well as aromatics. The less gas in your coffee, the staler it will taste. This makes sense because if a coffee doesn’t bloom, it’s probably old.
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