"Common sense of hand brewing" How to judge the freshness of coffee powder?

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[Abundant bubbles indicate freshness]

Freshness is the key to delicious coffee.

More and more people are getting used to buying freshly roasted coffee beans directly from roasters, so there are many tips on how to identify the freshness of coffee beans. Among them, the most common one is:

Are there enough bubbles when brewing?

Freshly roasted coffee beans contain a lot of gas and have vigorous respiration. When they are extracted, the gas in the beans is released, and what we see are beautiful and plump bubbles. There is a very vivid adjective to describe it, "blooming". Yes, when fresh coffee beans are extracted, clusters of rich bubbles are like flowers in this season, blooming.

Accompanying it is the rich aroma of fresh coffee beans.

A deeper look into whether bubbles are abundant or not

During extraction, the richness of bubbles is positively correlated with freshness. The fresher, the more bubbles . However, there is a premise here, that is, for the same coffee bean. To be precise, it is the same raw bean, the same roasting, and the same operation.

The richness of bubbles will vary between different coffee beans, or between different roasting degrees of the same coffee bean, or between different operating coefficients of the same coffee bean.

To summarize simply: for the same coffee bean, the fresher it is, the richer the bubbles; for the same coffee bean, dark roasted ones will produce richer bubbles than light roasted ones.

Different coffee beans, apart from differences in roasting degree and other factors, will also show differences in hydrophilicity from the perspective of their own structure, which is most intuitively reflected in the speed of water absorption and the degree of foaming.

Tips for Adjusting Extraction

For the same coffee bean, if the existing extraction method is not ideal, you can consider: increasing the amount of coffee powder, increasing the thickness of the powder layer, and increasing the time the coffee powder combines with water; increasing the extraction water temperature to further stimulate the activity of the coffee beans; reducing the degree of grinding, grinding the powder finer, and increasing the contact area between the coffee powder and water molecules.

Of course, the above suggestions are for fresh coffee beans.

Adjusting each extraction factor will have a certain impact on the final coffee taste. The final taste of the cup still depends on the maker's control.

By adjusting many factors, you can get the "perfect cup" in your mind. Regardless of whether the result is as you wish, the process of pursuing deliciousness is also a wonderful experience. This is the fun of manual brewing.

I wish you all enjoy the fun of coffee during your hand-brewed coffee journey!

Disclaimer: Compiled and edited by "Coffee Workshop", please indicate the source when reprinting. This article is intended to spread coffee culture. If there is any infringement, please inform us to delete it. Thank you~!

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