Green Coffees Used
This page records the green coffees used throughout Coffee | One Roast at a Time.
It is not a buying guide or a list of recommendations.
It exists to provide factual context for roast notes, experiments, and observations documented elsewhere on the site.
The table below acts as an index.
The sections that follow provide additional context on how each coffee entered the project.
Green Coffee Index
| Coffee | Origin | Variety | Process | Supplier | Roasts |
|---|---|---|---|---|---|
| Guatemala – La Soledad | Huehuetenango, GT | Bourbon | Washed | 88graines | 1–7, 10 |
| Brazil – Topazio | Brazil | Topazio | Natural | 88graines | 8, 9, 11 |
| Brazil – Yellow Bourbon | Brazil | Yellow Bourbon | Natural | 88graines | 12 |
| Ethiopia – Karume | Guji, ET | Heirloom | Natural | 88graines | 13 |
| Honduras – El Puente | Honduras | Catuai | Natural | 88graines | 14, 15 |
(Details reflect what was known at the time of purchase and use.)
Coffee Details & Context
Guatemala Huehuetenango – Finca La Soledad
Producer: Pérez Family
Variety: Bourbon
Process: Washed
Altitude: ~1650 m
Supplier: 88graines.com
Used in roasts:
Roast 1, 2, 3, 4, 5, 6, 7, 10
Context:
This coffee formed the initial reference baseline for the Gene Café CBR-301.
It was roasted repeatedly across different batch sizes and development strategies to establish confidence in system behaviour, first crack timing, airflow effects, and post-crack energy management.
Brazil – Topazio
Variety: Topazio
Process: Natural
Supplier: 88graines.com
Used in roasts:
Roast 8, 9, 11
Context:
This coffee introduced significant ambiguity around first crack audibility.
It became a key reference for learning to rely on weight loss, colour, aroma, and total roast time rather than sound alone.
Brazil – Yellow Bourbon
Variety: Yellow Bourbon
Process: Natural
Supplier: 88graines.com
Used in roasts:
Roast 12
Context:
Roasted using time and weight-loss guardrails rather than audible crack confirmation.
Helped reinforce that quiet naturals can still produce clean, drinkable results when development is controlled.
Ethiopia Guji – Karume
Variety: Heirloom
Process: Natural
Supplier: 88graines.com
Used in roasts:
Roast 13
Context:
First Ethiopian natural used in the project.
Provided contrast against Brazilian naturals, particularly in crack audibility, aroma development, and perceived roast progression under the same system constraints.
Honduras – El Puente
Producers: Marysabel Caballero & Moises Herrera
Variety: Catuai
Process: Natural
Altitude: 1500–1680 m
Supplier: 88graines.com
Used in roasts:
Roast 14, Roast 15
Context:
Used explicitly as a development-contrast experiment.
Clear, audible first crack made it useful for isolating post-crack timing decisions and validating development intent against cup results.