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Coffee Ad Astra

A Scientific Approach to Coffee Brewing

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Category: Chemistry

Posted on November 12, 2019November 13, 2019

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.

Resources

  • Grind Size Application
  • Current V60 Recipe
  • A V60 Pour Over Video
  • Current Siphon Recipe
  • Flavor Wheels
  • Brew Water Crafter Tool
  • Water Recipes Spreadsheet
  • Bottled Water Spreadsheet
  • Coffee Filters Analysis
  • Cupping Statistics Widget
  • Extraction yield equations
  • Coffee control chart (percolation)
  • Coffee control chart (immersion)
  • Coffee Glossary by Mitch Hale
  • Specialty Coffee Association Standards
  • Barista Hustle
  • Scott Rao’s Blog
  • Mitch Hale’s blog
  • David Seng’s Water Crafter

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I just publicly released my latest blog post about getting a more consistent kettle flow for pour over coffee (link in bio) ! In that post, I discuss a weird flow valve called the Mandritech Hand Drip Water Valve and a flow restrictor only available in Asia that fitted my @mybrewista artisan 0.6L kettle. I also just released the next post on Patreon (link also in bio) which discusses the physics of fines migration. I discuss some physics papers that detail some very counter-intuitive ways in which fines and boulders flow around in the presence of vibrations. These papers blew my mind and changed how I view fines migration ! By the way, if you enjoy my blog don’t forget to vote on my Sprudgie Award nomination before January 3, 2020 ! The link to the voting page is in my bio. 
#coffeegeeks #coffeescience #finesmigration #pourover #coffee #coffeeadastra #brazilnuteffect
I just put a Q&A page online on my website ! You'll find in it several questions I receive often by DM, email or in various chatrooms. They are mostly about filter brewing and brew water crafting. See the link in my bio for more. Also, if you haven’t voted yet there are only 4 days left to vote on my Sprudgie award nomination for best coffee writing ! Link is also in bio, any help is super appreciated ! #coffeegeeks #coffeescience #pourover #coffee #coffeeadastra #waterforcoffee #sprudgie
Ok, this is something else entirely. I just received some of the latest air roasted batches from @heartroasters, and I am almost lost trying to interpret what I’m drinking. I first tried the Ethiopia Worka with my usual recipe, and it feels like I am drinking grapefruit juice, with a ton of floral aromas on top of it. It barely registers as coffee in my brain, and I am enjoying it so much. I probably never drank a 320 mL of coffee so fast. The head roaster at Heart was telling me that when they cupped their air roasts next to their drum roasts they found new taste defects they had just never noticed in their drum roasts because they were always there, and I must say my experience fits this. The taste feels a lot more even, with much less noise to appreciate the subtle origin characteristics. I’m now really excited to taste more of these batches. I’m really hopeful this could be the first glimpse of a new standard in roasting. The extraction yield was pretty normal on this coffee, 1.44% TDS for 319g with a 22g dose so 20.8% EY, about the average I get for washed ethiopians. I’ll try grinding finer and see what happens, I’m curious to figure out if astringency kicks in slower with these more even roasts ! Disclaimer: While I paid for a Heart order, they sent me several extra bags for free, including this Worka (batch 48270, roasted on Dec 10) #coffeegeeks #coffeescience #coffeeadastra #coffee #pourover
I’m super excited to announce that my blog Coffee Ad Astra was nominated for a 2019 Sprudgie Award for best coffee writing ! An online voting poll was just started by @sprudge to determine the winner (link in bio), any help is appreciated 😊 The poll closes at midnight PST on January 3 ! #coffeeadastra #coffeegeeks #coffeescience #sprudgie #sprudge #sprudgieawards #sprudgieawards2019 #sprudgies
My friend @apaxos is doing a coffee giveaway in collaboration with @kaffebox, have a look at his latest post to participate ! #coffee #coffeegeeks
Alright, today I realized that all links in my bio mysteriously stopped working only when clicked from here right after I added a link to another social media site that competes with Mr. Robotface. And it mysteriously started working again once I removed it. As I am not exactly happy about this, I propose that we play a little game. The prize of this game will be more regular posts from me, because I will now randomly hold on from posting a fraction of my content here, and only post it on the destination this game will lead you to. To win this game, you just need to figure out this simple charade: My first half is the same as a small box with moving images in it. My second half is the same as the website you are currently on. If you go one alphabet letter further for each character in the complete answer, you get this word: Ufmfhsbn. PLEASE do not post the answer in the comments. It is a word that got other content creators’s IG posts hidden for a couple days. Once you solved it, just go to my blog and click on the answer in the website’s header menu. I will be waiting for you there. Let’s see if this gets past Mr. Robotface’s triggers :) #coffeeadastra
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Credits

Website logo by Daniel Demay

All the better-looking photos on this website are by Noé Aubin-Cadot

Most Amazon links on this website are "affiliate", which means I get a small commission if you buy through them, at no cost to you.

Resources

  • Grind Size Application
  • Current V60 Recipe
  • A V60 Pour Over Video
  • Current Siphon Recipe
  • Flavor Wheels
  • Brew Water Crafter Tool
  • Water Recipes Spreadsheet
  • Bottled Water Spreadsheet
  • Coffee Filters Analysis
  • Cupping Statistics Widget
  • Extraction yield equations
  • Coffee control chart (percolation)
  • Coffee control chart (immersion)
  • Coffee Glossary by Mitch Hale
  • Specialty Coffee Association Standards
  • Barista Hustle
  • Scott Rao’s Blog
  • Mitch Hale’s blog
  • David Seng’s Water Crafter
  • RSS - Posts

Enter your email address to follow this blog and receive notifications of new posts by email.

Join 288 other followers

Blog Stats

  • 170,866 hits

Category Cloud

Announcements Blind Tasting Brew Methods Brew Temperature Chemistry Coffee Filters Coffee Grinders Coffee Processing Coffee Varietals Collaborative Posts Cupping Data Analysis Espresso Experiments Extraction Maths Particle Size Distribution Perception of Taste Physics Recipes Siphon Brews Storage and Maintenance Tasting Notes Tools V60 Brews Water for Coffee
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