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Tag Archives: Coffee geeks

More Even Espresso Extractions

In this post, I talk about ways in which I have recently improved my puck preparation for espresso.

Posted byjgagneastroJuly 16, 2022Posted inEspresso, Extraction, PhysicsTags:Coffee brewing, Coffee geeks, Espresso1 Comment on More Even Espresso Extractions

The Physics of Fines Migration

In this post, I explore the details of physical phenomena that can cause fines to migrate and clog coffee filters.

Posted byjgagneastroFebruary 1, 2020January 31, 2020Posted inExtraction, Particle Size Distribution, Physics, V60 BrewsTags:Coffee brewing, Coffee Filters, Coffee geeks, Coffee science, Fines Migration3 Comments on The Physics of Fines Migration

What is Astringency ?

In this post I describe what causes astringency, and talk about ideas how we could potentially measure it or remove it post brewing.

Posted byjgagneastroNovember 12, 2019November 13, 2019Posted inChemistry, Perception of Taste, Tasting Notes, ToolsTags:Coffee brewing, Coffee geeks, Coffee science45 Comments on What is Astringency ?

Measuring Coffee Concentration with a 0.01% Precision

In this post I present an updated methodology to measure TDS with a 0.01% precision using a refractometer.

Posted byjgagneastroSeptember 21, 2019October 14, 2019Posted inData Analysis, ToolsTags:Coffee geeks, Coffee refractometer12 Comments on Measuring Coffee Concentration with a 0.0112 Precision

A Tool and Videos for Crafting Custom Brew Water

In this post, I present a new tool to create custom brew water recipes, which can be built from any soft water rather than distilled water.

Posted byjgagneastroAugust 23, 2019November 28, 2019Posted inTools, Water for CoffeeTags:Coffee brewing, Coffee geeks, Coffee science, Water for Coffee21 Comments on A Tool and Videos for Crafting Custom Brew Water

An In-Depth Analysis of Coffee Filters

In this longer than usual post, I do a very detailed microscope analysis of various V60, chemex and siphon paper and cloth filters.

Posted byjgagneastroAugust 4, 2019September 2, 2019Posted inCoffee Filters, Data Analysis, MathsTags:Coffee brewing, Coffee Filters, Coffee geeks, Coffee science66 Comments on An In-Depth Analysis of Coffee Filters

Seasoning Grinder Burrs and Grind Quality

This post is a detailed discussion of the effects of coffee grinder seasoning on particle size distributions.

Posted byjgagneastroMay 27, 2019May 30, 2019Posted inCoffee Grinders, Particle Size DistributionTags:Coffee geeks, coffee grinder, EG-1 grinder, Grinder seasoning15 Comments on Seasoning Grinder Burrs and Grind Quality

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I'm happy to announce I have teamed up with @flairespressomaker and @weberworkshops for a nice giveaway this week; you can win a Flair 58 + Weber Workshops Unifilter along with my book :) follow the link in my bio to enter the giveaway !
I just published a new blog post on my Patreon (link in bio) about particle size distributions, with a discussion of how burr spacing, rpm, burr geometry affects them, and how to characterize different styles of particle size distributions. This is one of my most data heavy posts so far, thanks a ton to @weberworkshops for sharing their data.
I just posted a new blog post on my Patreon (link in bio) about my updated understanding of the mechanisms that I believe cause astringency in coffee, with hints about avenues we might use to reduce it. The post is immediately available on Patreon and will become publicly available in about 2 weeks !
@pullandpourcoffee created yet another awesome visual to convey some of my recent understandings of espresso physics ! I think this phenomenon has often been misconstrued as puck erosion or degradation, whereas this will happen in even the most well behaved espresso shots !
I will be teaching my second class on the physics of coffee during WOC Milan this summer ! The class will be on June 24, 8-11 AM in a beautiful room owned by @bwtglobal.
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