咖啡細粉是風味的來源 Fine ground coffee powder is the source of flavors
After the coffee is ground, in addition to the originally set grind size, there will still be some fine powder and coarse powder mixed with it. The amount of fine powder depends on the grinder. However, although fine powder is easy to over-extraction, also is the part that can be most fully extracted.
This picture shows the coffee powder after grinding by a hand grinder. The fine powder and coarse powder are separated after sieving. Different grinders produce different amounts of fine powder.
If we want to avoid over-extraction and sift out and discard the fine powder, the coffee tends to be thin and less mellow. In order to enhance the mellowness, it is usually adjusted by reducing the powder to water ratio from commonly used 1:15 to 1:10 to extract the coffee. However, by reducing the amount of water added to adjust the mellowness, the coffee becomes smaller potion, and the coffee powder is wasted. How to maintain the powder to water ratio of 1:15 and retain the mellowness?
If we keep the fine powder and extract it together, we will find that the flavor fully enhanced, and mellowness increased. Under proper control, the coffee is full of flavor, also rich and structured.
According to research, water can only penetrate to a depth of 100 μm (microns) from the surface, and how big are the coffee bean particles used for pour-over coffee? Generally, it’s about 900μm (microns), so please imagining that 100μm (microns) on the top, bottom, left and right of the height of 900μm (microns) are penetrated by water and extract soluble substances, then the center of each particle, a large part is not extracted. The fine powder is relatively small, isn’t it easier to be extracted completely and bring out a full flavor?
Coffee fine powder is the source of flavor. Some people can brew coffee with or without sifting. How to make good use of fine powder without over-extracting can enhance the flavor of the whole cup of coffee. If you want to try it out, you can add the sifted fine powder in the middle of the brewing process. You may find that you fall in love with this little trick that makes coffee more fragrant and delicious.
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