Map roast stages to flavour outcomes¶
title: "Map roast stages to flavour outcomes" tags: [coffee/roasting] status: Draft aliases: [] related: []
Below is a stage-by-stage mapping of coffee roast progression to flavour outcomes, structured the way professional roasters and educators typically frame it.
Green → Yellow (Drying Phase)¶
Sensory state
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No “coffee” flavour yet
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Grassy, cereal, hay-like aromas
Flavour implications
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Uneven drying leads to hollow or baked cups later
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Proper drying sets the foundation for clarity and balance
Key risk
- Rushing → scorched exterior, raw interior
Yellow → Light Brown (Maillard Phase)¶
Dominant reactions
- Maillard reactions (sugars + amino acids)
Flavour outcomes
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Sweetness begins to form
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Toast, biscuit, malt, nut
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Increased body and mouthfeel
Roaster leverage
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More time here = greater sweetness and balance
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Too little = sharp acidity, thin body
First Crack (Light Roast Threshold)¶
Structural change
- Bean expansion and porosity increase
Typical flavours
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Bright acidity
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Floral, citrus, stone fruit
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High origin clarity
Acidity profile
- Lively, crisp, sometimes wine-like
Common risks
- Underdevelopment → sour, grassy, peanut-like
Early Development (Light–Medium Roast)¶
Chemical focus
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Controlled caramelisation
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Acid smoothing
Flavour outcomes
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Sweet citrus, apple, pear
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Honey, light caramel
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Balanced acidity and sweetness
Typical use
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Specialty filter coffee
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Origin-forward espresso
Mid Development (Medium Roast)¶
Chemical focus
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Deeper caramelisation
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Reduced volatile acids
Flavour outcomes
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Milk chocolate, caramel
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Roasted nuts
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Rounded body, reduced sharpness
Balance
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Peak “crowd-pleaser” zone
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Origin character still present, but softened
Late Development (Medium-Dark Roast)¶
Structural change
- Oils begin migrating outward
Flavour outcomes
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Dark chocolate, cocoa
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Toasted sugar, molasses
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Lower acidity, heavier body
Trade-off
- Increased roast character at expense of origin nuance
Second Crack (Dark Roast Threshold)¶
Structural breakdown
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Cellulose fracture
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Surface oils appear
Flavour outcomes
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Smoky, spicy, carbonised notes
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Bitter chocolate
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Very low acidity
Common descriptors
- Char, ash, tobacco, burnt sugar
Beyond Second Crack (Very Dark Roast)¶
Dominant flavours
- Carbon, smoke, bitterness
Outcome
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Origin indistinguishable
-
Roast defects amplified
Use cases
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Rare in specialty
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Occasionally for traditional or blended styles
Summary Table (Condensed)¶
| Roast Stage | Acidity | Sweetness | Body | Dominant Flavours |
|---|---|---|---|---|
| Light | High | Moderate | Light | Floral, citrus, fruit |
| Light–Medium | Balanced | High | Medium | Fruit, honey, caramel |
| Medium | Moderate | High | Medium–Full | Chocolate, nuts |
| Medium–Dark | Low | Moderate | Full | Cocoa, molasses |
| Dark | Very Low | Low | Heavy | Smoke, ash |
Key Insight¶
Flavour is not determined by temperature alone, but by time allocation across stages, especially:
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Maillard duration (sweetness and body)
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Development time after first crack (balance vs bitterness)
This framework is particularly useful for:
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Teaching roasting fundamentals
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Designing roast profiles
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Explaining flavour differences to customers
A one-page printable teaching chart