Development Phase Post First Crack · Controlled extension for body and sweetness

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When Heat Goes Wrong: Defining the Burn

Over-roasting is not simply a matter of going "a bit darker." It represents a fundamental breakdown of the Coffee Burn bean's cellular architecture, a point of no return where the thermal energy applied exceeds what the organic material can structurally withstand. The transition from a well-developed dark roast to a genuinely burnt Coffee Burn is marked by the passage through Second Crack and beyond — a threshold that, once crossed, initiates a cascade of destructive chemical processes that cannot be reversed.

Second Crack typically occurs between 224°C and 230°C (435–446°F), and it signals that the bean's cellular walls are fracturing under thermal stress. Beyond this point, the roasting process ceases to be one of development and becomes one of carbonization. The oils that have migrated to the surface of the bean — once carriers of complex aromatic compounds — begin to break down into simpler, harsher molecules. The sugars that contributed sweetness and body are converted into bitter carbon compounds. What was once a living agricultural product becomes, in essence, partially charred organic matter.