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Published: 2026-07-13 Author: World Gafei

Last Updated: 2026/07/13, Professional coffee knowledge exchange more coffee bean information please follow the coffee workshop (Wechat official account cafe_style) 1. The air in this seam has a different thermal conductivity from the beans outside. If it will cause the two temperatures to be different. Most of the problem is that the air inside is much hotter than beans. For example, the oven is too hot, or the beans are not thoroughly dry. You'll see the middle.

Professional coffee knowledge exchange More coffee bean information Please pay attention to coffee workshop (Weixin Official Accounts cafe_style)

1. The air inside this crack has a different thermal conductivity than the beans outside. If it causes the two temperatures to be different. Most likely the problem lies in the fact that the air is much warmer than the beans. For example, it's too hot to get out of the oven, or the beans aren't dry enough. You'll see that the middle is more burnt than the sides. Generally, after burning, the explosion will be a little faster, perhaps not dense. At this time, it is very likely that some beans have not been baked yet, and the taste will be astringent. And the over-burnt parts will taste bland. Like bitter soda crackers.

2. The same bean may have different moisture content. This is about processing. This is common in washed beans. Uneven drying will result in black spots. The result was also a burnt and astringent taste. I hate this bean. Everyone loves African coffee beans. It always baked well. This is also relevant to Africa drying. At least the beans are uniform, and although the altitude is high, the beans are thick and the 1 burst is always dense. Have you noticed that high-altitude beans from South America don't bake so easily? Because it's wetter in South America. And it's not as expensive as water in Africa, so there's always washed beans.

3. High altitude can also make small irregularities more pronounced. Beans are thicker at higher altitudes and generally taste more complex because beans ripen more slowly. Subtle flavors are more pronounced. However, small defects, such as uneven moisture and uneven constitution caused by insufficient nutrition, will be more obvious. Therefore, this will also cause the above uneven baking, baking out the essence of the beans taste problems.

4. The focus of the surface is usually due to the beans being scalded. For example, the barrel baker will touch the metal barrel. Create focus. Some direct-fire baked beans will also be too close to the heat source, causing the surface charred phenomenon.

FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。