tags: [] - coffee/tasting - coffee/sensory - coffee/roasting aliases: - Burnt coffee - Scorched coffee - Over-roasted

Burnt¶

Tags: #coffee/tasting #coffee/sensory #coffee/roasting Aliases: Burnt coffee, Scorched coffee, Over-roasted Related: Coffee Defects MOC | Flavour Development MOC | Ashy | Roasting | Roast Profile Status: ✅ Complete

Overview¶

Burnt is a negative sensory descriptor in coffee tasting referring to aggressive, harsh, charred flavour and aroma characteristics resulting from over-roasting or scorching. Unlike the milder "ashy" descriptor (dry, powdery), burnt implies a more intense, sharp, acrid character — reminiscent of badly charred food or scorched material. Burnt character is a roasting defect caused by excessive heat, carbonisation, or surface scorching of the coffee bean, and represents significant quality loss. In SCA cupping, burnt is a major fault causing substantial score deductions.

Causes of Burnt Character¶

Over-roasting (beyond second crack): Roasting well into or past second crack produces carbonisation of bean structure. All positive aroma compounds are destroyed and replaced by harsh, acrid charcoal compounds.

Scorching (drum roasters): In drum roasters, contact between beans and an excessively hot drum surface during the early, high-moisture phase can scorch the bean surface. The interior develops normally but the exterior is scorched, producing a burnt-surface character.

High charge temperature: Loading green coffee into an overheated roaster drum causes immediate scorching of the bean surface before the interior has dried.

Bean surface combustion: In extreme over-roasting, oils that emerge from the bean at second crack can begin to combust.

Descriptor	Character	Severity
Roasty	Dark chocolate, bitter roast	Acceptable in dark roast
Ashy	Dry, powdery, cigarette ash	Moderate defect
Burnt	Sharp, acrid, harsh charcoal	Severe defect
Scorched	Surface burning; acrid but with some positive	Moderate defect
Carbony	Coal-like, extreme carbonisation	Severe defect

Brewing Context¶

Burnt character can also arise from brewing errors independent of roasting: - Overheated brew water (> 100°C): Not typical in home brewing but possible in poorly maintained commercial equipment - Holding brewed coffee on a hotplate too long: Thermal degradation of brewed coffee produces burnt, stale, acrid notes over 30–60 minutes - Over-extended espresso shot: Channelling with fine grind can scorch grounds locally

Key Facts¶

Burnt is a severe roasting defect: acrid, harsh, charred character from over-roasting or scorching
More intense than "ashy" (dry/powdery); burnt implies aggressive, sharp charcoal character
Caused by roasting past second crack, drum scorching from high charge temperature, or extreme heat
Brewing errors (coffee held on hotplate, over-extracted shots) can also produce burnt character
SCA cupping: major fault (−4 points per affected cup) reducing Clean Cup and Flavour significantly

References¶

Changelog¶

Date	Change
2026-04-28	Note created
2026-04-30	Added --- separator before copyright

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