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What is Coffee Bloom?

What is coffee bloom?  When making pour over coffee, pour a small amount of boiling water over the grounds and wait for 30-40 seconds.  You’ll notice the coffee grounds degassing, that is they release CO2 as bubbles.  By releasing the CO2 before you complete your brewing you are improving the taste because CO2 infuses a sour taste into the coffee.  The CO2 bubbles also repel the water which interferes with the brewing process.  

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