How to Make Decaf Coffee? How is Decaf Coffee Made? Decaf Coffee Processing Methods

How Decaf Is Actually Made

The main methods for producing low-caffeine and decaffeinated coffee beans are as follows.

1. Direct contact method: chemical solvents such as methylene chloride and ethyl acetate are used to dissolve the caffeine inside the beans.

A notable example is the German EA (ethyl acetate) water process, founded by Dr. Erich Scheele in 1931, who held numerous patents in caffeine-processing technology. Caffeine is extracted today through Coffein Compagnie's Water-EA treatment process, followed by polishing and cupping quality control.

2. Swiss Water Process: green beans are soaked in water to draw out the caffeine, the soaking water is filtered through activated carbon to remove the caffeine, and the filtered water is reused to soak the beans again. The drawback is that the coffee's original flavor is largely lost, leaving excessive charred and smoky notes.

3. Carbon dioxide extraction: liquid carbon dioxide dissolves the caffeine in the beans, but this requires special manufacturing conditions at 200-300 times atmospheric pressure, making it extremely expensive. Coffee processed this way is very rare on the market.

4. Genetic engineering: the University of Hawaii has researched ways to make coffee trees "forget" to produce caffeine, but this remains experimental.

Low-Caffeine and Decaf, Explained

Low-caffeine and decaffeinated coffee is processed after the green beans are harvested, when they are sent to "pharmaceutical factories" to have the caffeine washed out. That is genuinely how it works: some pharmaceutical preparations require added caffeine, and these factories draw on coffee as their caffeine source.

Once the caffeine has been washed out of the beans (using chemical methods, not ordinary washing), the beans are dried and roasted to become the low-caffeine or decaffeinated coffee in your hands.

FrontStreet Coffee's Pour-Over Suggestions

Little Fuji 3.5 V60 dripper, 90°C water temperature, 1:15 ratio, total duration of two minutes.

FrontStreet Coffee Recommendation

Decaf and washed coffee share a common thread: both are about removing something cleanly and leaving the bean's own character intact. Washed processing — float the cherries, depulp, ferment to strip the mucilage, rinse, dry, and hull — keeps more of the bean's inherent aroma while giving a bright, clean cup with a fresh feel, which is exactly the clarity a good decaf should preserve.

Among FrontStreet Coffee's washed single origins, three stand out. FrontStreet Yirgacheffe Gedingding Cooperative comes from a village-level processing team in Gedingding and is a good illustration of why washed coffee is prized: the method draws out the most from the beans, so medium-light roasted it shows jasmine florals and bright citrus acidity alongside green tea and honey notes — suited to pour-over, cold brew, or espresso. FrontStreet Kenya Cherry Tomato is one of the best-known washed coffees anywhere, since Kenya excels at double washing. The Thika region lot is grown at 1550-1750 m from the classic SL28 and SL34 varieties, given Kenya's 72-hour double washed fermentation, then light roasted to protect its lively acidity and layered fruit. You can smell concentrated dried cherry tomato and florals dry; in the cup there is clear cherry tomato and smoked plum, bright and solid acidity like freshly pressed juice, a sweet mid-palate with pear and black plum, and a clean, long finish of brown sugar and faint green tea. FrontStreet Jamaica Blue Mountain No.1 is the third: Jamaica's island climate brings shorter sunlight hours, so washing — removing skin, pulp, and mucilage before drying to cut moisture and shorten drying time — became the standard, producing translucent beans with a low defect rate. The result is a rich Blue Mountain aroma with hazelnut, cream, chocolate, and caramel purity and a balance in which no single note dominates or goes missing.

All three reward a straightforward pour-over: a medium-fine grind, water in the low 90s Celsius, and a 1:15 ratio poured in stages. Washed coffee like this is also unusually tolerant of time — it holds up well in long warm-holding or as iced coffee, so it is a comfortable choice for anyone exploring decaf-style, low-bitterness brewing.