Washed coffee, also referred to as the wet process, the coffee cherry is pulped by a machine referred to as a pulper. Big surprise there. This means that the outer layer of skin is removed. Once this outer layer has been removed, the bean with is mucilage is then fermented in water for at least one to two days and sometimes longer. After the fermentation process, the bean is then washed from its mucilage after it has released its aroma.
Of all the coffee processing methods, this method often produces the highest quality coffee. However, it requires a lot of skill and water in order to perform correctly. Some of the world’s finest (and often most expensive) coffees are created using this process.