Definitely some surprises in this one for me! I suspect this is a topic that I'm not yet done with, so very interested to hear your thoughts or suggestions for future tests!

Related videos:
Caffeine Explained:    • Caffeine: Explained  
Wired Coffee Support:    • James Hoffmann Answers Coffee Questio...  

Timestamps:
0:00 Intro
0:53 How the analyser works
2:39 Test 1 Filter vs. Espresso
3:59 Test 2 Cumulative Extraction
7:53 Test 3 Contact / Steep Time
9:17 Test 4 Instant Coffee
13:28 Test 5 Light vs Dark roast
16:42 A Note On Caffeine Variance in Different Coffees
18:09 Wrap Up

Links:
Patreon:   / jameshoffmann  
Limited Edition Merch: https://geni.us/TensHundredsThousands

My Books:
How to Make The Best Coffee At Home: https://geni.us/howtomakethebestcoffee
The World Atlas of Coffee: http://geni.us/atlasofcoffee
The World Atlas of Coffee Audiobook: https://bit.ly/worldatlasofcoffeeaudio
The Best of Jimseven: https://geni.us/bestofjimseven

Find me here:
Instagram:   / jimseven  
Twitter:   / jimseven  

Things I use and like:
My video kit*: https://kit.co/jimseven/video-making-...
My current studio coffee kit*: https://kit.co/jimseven/studio-coffee...
The kitchen set shelving is by Studio Hausen*: https://bit.ly/studiohausen (they gave me a 10% discount code to share with you which is RGNNV1D)
My glasses: http://bit.ly/boldlondon
My hair product of choice: https://geni.us/forthehair
*Affiliate links