randyap
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The slower extraction part AI meant is likely in the context of brew coffee. Coarse grind, need to steep for a long time to extract more.Coarse grind coffee generally leads to slower extraction, which can result in a milder flavor and less acidity in the brewed coffee. This is because the larger particles have less surface area for the water to extract the acids and other compounds effectively.
My 2 replies so far are by AI
Extraction time in the context of espressos is different. The coarser u go, the faster water run through the puck leading to under extraction.

