How Many Layers Coffee Bean and How Process

There are 5 layers of coffee fruit, from outside to inside: skin, pulp, endocarp (parchment), silverskin, seeds (coffee beans).

Skin and pulp are the outermost skin and pulp that wrap around the berry. Except for natural sun drying, coffee beans processed by other methods must be peeled and pulped within a few hours after picking.

For coffee, skin and pulp are important by-products. In some producing areas, people use coffee skin and pulp to make tea. People in the industry usually call coffee skin and pulp "pulp", and the machine used to remove pulp is called "pulper".

Under the skin and pulp is the endocarp, which is a layer of light brown nut skin that wraps the silver skin. After drying, this film looks like parchment, so it is also called parchment.

Under the parchment, there is another thinner film that wraps the coffee beans, which is the silver skin. Because of its shiny and silvery color, people usually call it "silver skin". This layer of silver skin will fall off during roasting. Usually you will find some silver fragments in the coffee powder when grinding it. These fragments are the silver skin that failed to be separated from the coffee beans during roasting.

The innermost is the coffee bean. Generally, each fruit contains 2 coffee beans (except for Peaberry, which is a single bean in a pod). After the coffee beans are dried and processed, they can be roasted.

After washing, the fresh coffee berries are put into the peeling machine to remove the peels. Because after removing the peels, the shelled coffee beans are still covered with a layer of mucus (also known as "pectin") that cannot be dissolved in water. Stacking these coffee beans and fermenting them will quickly decompose the mucus and make it easy to be washed away by water.