Fines Migrate in Espresso: Stronger Evidence

Coffee Data Science

Definitive Proof of the Theory

For 30 years, the theory of fines migration has been generally accepted as truth in the espresso community. The theory is that finer particles migrate during an espresso shot, and this migration has an impact on extraction.

Previously, I have provided a few experiments where I didn’t find evidence of fines migration, but I still felt compelled to check my experiments to make sure they were not wrong. In particular, academic research …

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