Green Coffee

Green coffee is the raw, unroasted seed of the coffee cherry. After the fruit is harvested and processed—using methods such as washed, natural, or honey processing—the resulting product is a stable, dried seed that can be stored and transported. This state is the primary form in which coffee is traded globally, serving as the essential raw material for roasters who transform these seeds through heat to develop the complex aromatic and flavor compounds familiar to consumers.

The classification of green coffee is a critical industry practice that bridges the gap between agricultural production and sensory quality. Standards, such as those established by the Specialty Coffee Association (SCA), provide a framework for evaluating coffee through physical assessment. This includes measuring moisture content, screen size, and identifying physical defects. These defects are defined as material properties of the bean that are broadly perceived as negative, and ongoing research, such as projects by the Coffee Science Foundation, continues to investigate the specific sensory impact these physical flaws have on the final cup.

Grading systems vary by origin and market, often combining physical metrics with sensory evaluation. While some countries utilize specific size-based grades—such as 'AA' or 'AB' in Kenya or altitude-based classifications like 'Strictly High Grown' (SHG) in Honduras—the SCA’s 100-point scale remains the industry benchmark for defining 'specialty' coffee. A coffee must score 80 points or above on this scale to be classified as specialty grade, distinguishing it from commercial-grade coffee.

For farmers, the grading process is a vital tool for quality control and market access. High-scoring specialty coffee often commands premium prices, incentivizing producers to refine their agricultural and processing techniques. Conversely, for roasters, understanding green coffee is a prerequisite for successful roasting. Roasters must evaluate samples to ensure they meet their quality standards, as the physical state of the green bean—its density, moisture, and uniformity—dictates how it will behave in the roaster and ultimately how it will taste.

Beyond its role in brewing, green coffee has industrial applications, such as the production of green coffee extract. This extract is used in various products, including weight-loss supplements and the Swiss Water process, a commercial method for decaffeinating coffee that relies on the solubility of caffeine in water rather than chemical solvents. These applications highlight the versatility of the raw bean beyond the traditional roasting and brewing cycle.

Currently, the industry is moving toward more holistic evaluation methods, such as the SCA’s Coffee Value Assessment system. This approach encourages a systematic, transparent discovery of a coffee's value by separating physical assessments from sensory impressions to avoid bias. By grounding these assessments in both physical science and sensory data, the coffee industry aims to create a more objective language for describing quality, ensuring that the value of a green coffee lot is accurately communicated from the farm to the final consumer.