How Coffee Beans Are Processed: Washed vs Natural

When you sip a cup of coffee, you're experiencing the end result of a long chain of decisions—starting the moment the coffee cherry is picked. One of the earliest and most critical choices? How those cherries are processed. The method used to remove the fruit from the seed shapes everything from aroma to body. So how exactly are coffee beans processed after harvest?

Coffee beans are processed using one of two main methods: the washed (or wet) process, and the natural (or dry) process. The washed method generally results in cleaner, brighter flavors, while the natural method tends to produce fuller-bodied, fruitier cups. Each method involves distinct steps from cherry to green bean.

What Is the Natural (Dry) Process?

The natural process, also called the dry process, is one of the oldest methods of preparing coffee beans. In this approach, whole coffee cherries are spread out to dry in the sun immediately after harvest. On farms, this typically means laying out about 50 square meters of cherries per hectare. Alternatively, some producers use specialized drying equipment.

As the cherries dry, the fruit around the seeds slowly dehydrates. Once fully dried, the cherries go through a two-cylinder machine that separates the dried husk from the bean. Then, a sieve-like system removes the inner parchment layer. Finally, beans are sorted by size and shape, with any round beans—known as peaberries or caracolitos—set aside for separate sale. This entire process requires careful monitoring to prevent mold or over-fermentation.

What Is the Washed (Wet) Process?

The washed process, also referred to as wet processing, produces what are commonly called 'washed beans' or 'washed coffee.' This method begins with washing freshly picked cherries to remove the outer fruit. Then, the beans are soaked in water for around 36 hours to encourage fermentation, which helps break down the remaining mucilage (fruit layer) on the seeds.

After fermentation, the beans undergo thorough washing. They are then dried—either in the sun or with mechanical dryers—until only a thin parchment layer remains. Once fully dry, this final silvery skin is removed, leaving behind the 'naked' green coffee bean. The beans are then sorted by size and packaged, typically in 60-kilogram units.

This method is widely regarded for producing higher-quality coffee compared to the natural process, thanks to cleaner flavors and more consistent results.

How Are Coffee Beans Sorted and Packaged?

Regardless of the processing method, sorting is a critical step before coffee beans are sold. Sorting can be done manually, often relying on skilled labor similar to that used during cherry picking, or mechanically. Either way, the goal is to remove underripe or defective beans and ensure only high-quality seeds move forward.

In regions known for cultivating premium coffee varieties, advanced machinery is often employed to achieve greater precision in selecting the best beans. After sorting, beans are categorized by size—often with screening tools—and then packaged. For washed coffee, a standard unit is 60 kilograms per bag.

Frequently Asked Questions

What are the two main methods of coffee bean processing?

The two primary methods are the washed (wet) process and the natural (dry) process. The washed method involves removing the coffee cherry’s fruit before drying, while the natural process dries the entire cherry with the bean inside.

Which coffee processing method usually produces better quality beans?

Generally, the washed (wet) process is considered to yield higher-quality coffee beans compared to the natural (dry) method, due to cleaner flavors and more consistent processing results.

What is a peaberry in coffee processing?

A peaberry, also called a caracolito, is a small, round coffee bean that forms when only one seed develops inside a coffee cherry instead of the usual two. These are often sorted out and sold separately.

How long are coffee cherries dried in the natural process?

The article does not specify an exact duration, but it explains that cherries are dried either on the ground (about 50 sq m per hectare) or using special drying equipment until they are fully dehydrated before further processing.

What happens after fermentation in the washed coffee process?

After fermentation (typically 36 hours), the beans are thoroughly washed to remove any remaining mucilage, then dried either in the sun or in mechanical dryers until the final thin parchment layer is left, which is later removed.

How are coffee beans sorted by size?

Coffee beans are sorted by size using screening tools or mechanical sorters after drying and before packaging. This ensures uniformity and removes defective or immature beans.

Recommended FrontStreet Beans for Process Study

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright, floral washed profile, and their Ethiopia Guji Natural for a juicy, fruity example of dry-processed coffee. Both showcase how processing shapes flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.