Indonesia is perhaps best known for its unique wet hulling process (giling basah). Though its exact origins are unclear, wet hulling most likely originated in Aceh during the late 1970s.
Wet hulling’s popularity can be attributed to producers’ need for prompt payments. It was also adopted specifically by many producers who lacked the drying infrastructure that was needed to shelter drying parchment from the high humidity and inconsistent rainfall typical in Sumatra. At higher elevations with constant humidity and unpredictable rainfall, drying can prove to be slow, risky and difficult.
The basic process for wet hulling is as follows: Cherry is harvested and pulped at or near the farm on small hand-cranked or motorized pulpers. The coffee is fermented overnight in small tanks, buckets, or bags and washed with clean water the following morning. Parchment is sundried for between half a day and two days, depending on the weather. This first drying is for skin drying, which eases the removal of parchment.
At this juncture, the moisture content is between 30 and 40%. Parchment is delivered to a processor (often by the village collector) for wet hulling. A wet hulling machine is larger, requires more power and runs at a faster speed than a traditional dry huller. After the hulling, the coffee seed is whitish and pliable and is called labu. It is laid out to dry on tarps or patios, where it reduces in size and reaches 14 to 15% moisture content. This stage is known as asalan and is unsorted and with defects. Much of the internal commercial trade is for asalan. Exporters, most of whom are based in Medan, will finish the drying down to 12 to 13% moisture content and will sort and prepare coffee for shipment.
Our premium and specialty wet-hulled coffees are produced in direct collaboration with village collectors and processors so that the drying, storage and lot integrity remain in place from the farmer all the way to you. In this way, we can export cleaner, more stable and more traceable regional lots.
