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Keith E. Lyons, Author

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#immersion brewing

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How Coffee Extraction Works: Extraction Yield, TDS, and the 18–22% Range
BrewingSeptember 13, 2026 10 min

How Coffee Extraction Works: Extraction Yield, TDS, and the 18–22% Range

Coffee extraction is a solid–liquid process. This guide explains the difference between extraction yield and TDS, why the 18–22% range is a reference band rather than a rule, and how immersion, percolation, and espresso extraction differ.

The Complete World of Coffee

615 pages. 14 chapters. The definitive guide to specialty coffee.

$69.00 · Starts shipping October 2026

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