American coffee sour is bad? Why is black coffee sour?

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Recently, a friend asked about Qianjie coffee. Is American coffee bad for its sour taste? No, it is normal that black coffee such as American coffee, hand-brewed coffee and cold coffee can taste sour.

Why is some American coffee bitter and some sour?

The American coffee we drink every day can be bitter because most coffee shops use medium-and deep-roasted beans to make espresso, the base of American coffee. Due to the extension of baking time, coffee beans have a longer caramel response to darken the color and taste.

Espresso is an espresso machine that pressurizes hot water through finely ground coffee powder in a vacuum and extracts a small amount of espresso. The higher the concentration, the more concentrated the taste in the coffee. Although the addition of water diluted into American coffee, but everyone's perception of bitterness is different, so some people will think that American coffee is very bitter, and some will think that American coffee is not good enough.

From the above, we can see that the taste of American coffee mainly comes from the coffee bean itself. American coffee can have a sour taste, which may be due to the use of sour coffee beans to make espresso, individual coffee beans, or blended coffee beans.

For example, Qianjie Coffee is produced by daily stores using a sunflower blend of 30% Ethiopian sun Yega Shirley beans mixed with 70% Honduran sherry beans, in which Sun Yega provides a sweet and sour flavor for espresso, giving espresso a whisky and vanilla creamy flavor, while injecting soft acidity, making the coffee more rich.

Is it normal if there is sour taste in the coffee?

In addition, there are problems with its operation, for example, it is possible that the extraction process produces a channel effect, which leads to partial over-extraction and insufficient extraction of the coffee, and the coffee in the mouth will have a sour taste; or because the degree of grinding of the coffee is too thick, the coffee will have a sharp and thin taste, and the grinding is too fine and bitter to produce a bitter and bitter taste.

Of course, the coffee should be drunk as soon as possible after it is made. As the temperature of the coffee drops, the taste of the coffee becomes sour. Coffee that has been kept for more than an hour is no longer recommended. In particular, coffee with milk / sugar may change over time, resulting in a sour taste that is harmful to health.