Carbonic maceration is a fermentation technique borrowed directly from the wine industry — specifically from Beaujolais Nouveau production. Whole, intact coffee cherries are placed in sealed tanks that are flushed with carbon dioxide, creating a pressurized, oxygen-free environment. The intracellular fermentation that occurs within each cherry produces distinctive flavor compounds.
How it differs from anaerobic
While both methods use sealed, oxygen-free environments, carbonic maceration specifically involves:
- Whole cherries (not depulped seeds)
- Active CO2 injection to maintain positive pressure
- Intracellular fermentation — enzymes within the fruit break down sugars and acids inside the cherry, rather than relying primarily on external microbial activity
The result tends to be more nuanced and “lifted” than standard anaerobic processing.
What to expect in the cup
- Vibrant, wine-like acidity — red wine, Champagne-like effervescence
- Red and purple fruit — raspberry, cranberry, plum
- Floral aromatics — rose, jasmine, sometimes cinnamon spice
- Silky body — elegant rather than heavy
- Candy-like sweetness — hard candy, confectionary notes
Where it’s common
Colombian producer Camilo Merizalde (of Inmaculada Coffee Farms) helped popularize the technique in coffee. It’s now practiced across Colombia, Costa Rica, Panama, and Ethiopia, often reserved for competition-grade lots.
