After first crack, browning reactions become complex and rapid, and the color changes happening are relatively minor compared to the large flavor changes occurring—big changes in acidity, sweetness, and bitterness happen during this phase even though visual differences are subtle.

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Unknown Speaker (Coffee Expert)

Evidence Quote

Those color changes are relatively minor, but the flavor changes happening now are actually surprisingly large.

Source

Coffee Roasting ExplainedJames Hoffmann
Created: 8/13/2026, 9:53:30 AM

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