Why do some coffees taste sour?

Varieties such as Mocha, Colombia, Guatemala and Costa Rica. The degree of roasting is also related to the acidity of the coffee, usually the lightly fried coffee beans also contain organic acids, so the coffee washed out tastes sour, while the deep-fried coffee beans, because the high temperature of the fried beans has released the organic acids contained in the coffee beans, so the acidity of the coffee is low. The reason why the coffee will be sour is that the coffee is stirred too many times during brewing or the brewed coffee stays on the heat preservation plate for too long. Whether coffee tastes sour is mostly due to the variety of coffee, some of which have high acidity, such as Kenya, Mocha, Colombia, Guatemala and Costa Rica.

The degree of roasting is also related to the acidity of the coffee, usually the lightly fried coffee beans also contain organic acids, so the coffee washed out tastes sour, while the deep-fried coffee beans, because the high temperature of the fried beans has released the organic acids contained in the coffee beans, so the acidity of the coffee is low. The coffee is stirred too many times during brewing, or the brewed coffee is on the heat preservation plate.

Staying on for too long is the reason why the coffee will be sour.