Determining relative extraction without a refractometer

From http://www.baristahustle.com/to-blend-or-not-to-blend/

If you grind different coffees at the same setting and make espressos, you’ll quickly find out which coffees are less soluble by the shot times. (faster = less soluble) Or you can do cupping bowls.

If a coffee is less soluble it’s almost always less brittle as well. This makes for a “coarser” grind size. Best way to go without a refractometer.

This concept was the basis for my 80:20 Method. Keep extracting more until you reach a point where it’s not getting better. Then take a step back and you’ll be at the optimum extraction.

Author: korkiley

Systems Administrator at University of Vermont (retired as of 7/1/2012) Married Favorite Activities: Condor Glider Online Competition, Developing web sites, making espresso, and keeping a blog

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