Fine
Fine refer to ultra-fine coffee particles (smaller than 50 microns) that form during the grinding process and play a crucial role in shot (espresso) extraction. Although they make up only about 10% of the total coffee grounds by volume, they account for nearly 50% of the total surface area, significantly impacting extraction quality.
In specialty coffee, carefully managing fines helps create a natural filtration layer, which stabilizes water flow through the coffee bed, ensuring even extraction while preserving the complexity and purity of flavors in each sip.
However, if the concentration of fines is too high, this filtration layer can become too dense, restricting water flow and disrupting the extraction process. This can lead to an over-extracted or imbalanced shot, diminishing the nuanced flavors that define specialty coffee.
