In this post, I explore the details of physical phenomena that can cause fines to migrate and clog coffee filters.
Author Archives: jgagneastro
The Struggle for a Steady Kettle Flow
In this post I discuss recent developments in my efforts to stabilize my kettle flow rate.
The Hardness of Green Coffee
In this post, I show that surface hardness might vary more than mass density across different green coffees.
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.
What Affects Brew Time
In this post I discuss the variables that affect brew time in detail
Extraction Uniformity and Channeling
For a while now I’ve been trying to understand the details of channeling in pour over coffee, and I found it very difficult to find a convincing description of why channeling (and thus astringency) happens suddenly when we grind a bit too fine, even if the surface of the coffee bed looks flat at theContinueContinue reading “Extraction Uniformity and Channeling”
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.
An Investigation of Kettle Temperature Stability
In this post I investigate the stability of my Brewista kettle with the Brewcoat insulation and an additional layer of aerogel.
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.
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.
Coffee ad Astra 