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A scientific run-down of coffee blooming
Bubbles on the top of your coffee bed during the bloom phase of brewing aren’t just cute—they can tell you things about your brew.
As you pour water over your ground coffee, waiting patiently for that first sip of your pour-over that promises to bring you back to life, take a peek at what’s happening in the brew bed. The 8/29 bag still produced vigorous bubbling and tasted relatively the same as the prior day (which was surprising as well—I expected some degradation in flavor but couldn’t pick up on any). But darker roasted coffees are also more soluble and brittle, meaning that water can penetrate the ground particles more easily since their cellular structures are wide open.
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