Parchment

Parchment, technically called the endocarp, is a thin, rigid, papery shell that encases the green coffee bean inside the cherry. It sits between the mucilage layer on the outside and the silver skin (chaff) on the inside, serving as a protective barrier around the seed. Parchment is pale, yellowish-tan, and has a texture similar to thin cardboard or heavy paper. It plays a crucial role in coffee processing, storage, and quality preservation.

In washed and honey processing, the coffee is dried with the parchment intact — this stage is called "parchment coffee" or "café pergamino" in Spanish. After drying, the parchment is removed in a process called dry milling or hulling, using mechanical friction to crack and separate the shell from the green bean. In natural processing, the parchment is removed along with the dried cherry husk during hulling. Parchment acts as a natural protective layer that helps regulate moisture loss during drying and shields the bean from environmental damage.

Many specialty coffee producers and exporters store and trade coffee in parchment form for as long as possible before export. Parchment coffee retains freshness better than hulled green beans because the intact shell reduces the bean's exposure to oxygen, moisture fluctuations, and temperature changes. This practice — called "resting in parchment" — is common in Colombia, where coffee may rest for weeks or months in climate-controlled warehouses before the final dry milling and export preparation.

The quality of parchment removal affects the green bean's appearance and potentially its cup quality. Over-aggressive hulling can damage the bean surface, creating scratches or cracks that accelerate staling. Gentle, well-calibrated hulling equipment preserves bean integrity and produces the clean, uniform appearance that specialty buyers expect.