Hulling

Hulling is the step that strips away the protective dried layer around a coffee seed to expose the green bean underneath. For washed and honey coffees, that layer is the papery parchment. For naturals, it is the whole dried fruit husk. The job is done by a hulling machine at the dry mill, usually right before the coffee is graded, sorted, and bagged for export.

Why it matters: parchment protects the bean during storage, so coffee is often kept in parchment and hulled only shortly before shipping to preserve freshness and stable moisture. Hulling too aggressively can chip or crack beans, creating defects and fines; hulling coffee that is too dry or too damp causes similar damage.

You will not see hulling in your cup directly, but its quality matters. Clean, undamaged hulling yields whole, intact green beans that roast evenly. A related cosmetic step is polishing, which buffs off leftover silverskin.