tags: [] - coffee/roasting - coffee/roasting/roast-level aliases: - French roasted coffee - Heavy roast

French Roast¶

Tags: #coffee/roasting #coffee/roasting/roast-level Aliases: French roasted coffee, Heavy roast Related: Roasting MOC | Dark Roast | Development Phase | Development Time Ratio | Roast Profile Status: ✅ Complete

Overview¶

French roast is a very dark roast level characterised by bean temperatures typically above 225 °C at drop, heavy oil migration to the bean surface, a drop point during or after second crack, and an Agtron Gourmet score in the range of 25–35. The cup is dominated by roasty, smoky, and bittersweet notes — the origin character of the green coffee is largely or entirely masked. French roast has been associated historically with French and European coffee culture (though the name is imprecise — the roast level was more accurately associated with pre-specialty espresso tradition across southern Europe) and is commercially common in mass-market espresso blends, supermarket coffee, and traditional café-style brewing in many countries. In the specialty coffee era, French roast is relatively rare among quality-focused roasters.

Defining French Roast¶

French roast sits at the heavier end of the dark roast spectrum, darker than Vienna and lighter than Italian:

Roast Level	Agtron Gourmet	Drop Conditions
Vienna	35–45	Second crack beginning; oily surface
French	25–35	Second crack active; heavy oil; significant bean expansion
Italian	Below 25	Very dark; maximum oil; approaching carbonisation

At French roast temperatures, second crack — the second exothermic fracturing of the bean's cellular structure — is fully underway. This produces additional CO₂ and steam release, visible expansion of the bean, and the migration of oils to the bean surface from disrupted cell walls. The bean takes on a dark chocolate to near-black appearance with a wet, oily sheen.

Chemistry at French Roast¶

Prolonged development at French roast temperatures continues transformations that began during the main development phase:

Acid degradation: Chlorogenic acids, citric acid, malic acid, and other organic acids continue to degrade; the cup's acidity diminishes significantly
Caramelisation products: Sucrose caramelisation has long since passed the sweet caramel stage and entered the production of bitter, dark caramel compounds
Melanoidin accumulation: Brown-black Maillard-derived melanoidins accumulate, contributing to the dark colour and roasty flavour
Volatile compound loss: Many aromatic compounds that contribute to origin character (esters, aldehydes, floral compounds) have decomposed or volatilised at French roast temperatures; the remaining volatile profile is dominated by roasty pyrazines, furans, and phenols
Cellular disruption: Second crack physically fractures cell walls, releasing oils and significantly altering the bean's physical structure

Cup Profile¶

French roast produces a consistent sensory profile regardless of green coffee origin:

Aroma: Smoky, roasty, dark chocolate, carbon, caramelised sugar (darker)
Acidity: Very low to absent
Body: Initially appears full but can thin in very dark roasts as cellular structure breaks down; perceived body depends significantly on brewing method and extraction
Flavour: Dark chocolate (bitter), smoke, charred wood, caramelised dark sugar, carbon; no origin notes
Aftertaste: Persistent bitter, dry, roasty finish

Use in Espresso¶

French roast has been used in traditional espresso blending because dark roasting reduces acidity and produces soluble compounds that generate crema readily under espresso pressure. However, the specialty espresso movement has demonstrated that lighter, more origin-expressive roast levels can produce intensely complex and palatable espresso when extraction variables are correctly calibrated, substantially reducing the rationale for French roast in specialty contexts.

Key Facts¶

Agtron Gourmet 25–35; drop temperature typically above 225 °C; second crack active at drop
Bean surface: heavy oil migration; dark chocolate to near-black colour
Cup: smoky, bittersweet, roasty; very low acidity; origin character absent
Second crack causes cellular disruption and oil migration to surface
Acid, volatile aromatic, and origin compounds degrade significantly at French roast temperatures
Darker than Vienna; lighter than Italian within the dark roast spectrum

References¶

Changelog¶

Date	Change
2026-04-27	Note created

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