The sharing of coffee brewing technology summarizes several reasons why coffee is spoiled.

First, the reasons for the bitterness of coffee

1. The heat is too high

2. The cooking time is too long.

3. The coffee is ground too fine.

4. Sugar is of poor quality and is exposed to moisture.

5. Too much coffee and too little water

6. The bean grinder is not clean, and deep-baked beans are seeping into it.

Second, the reason for cooking too sour

1. The beans are ground too fine

2. Excessive stirring in the process of cooking

3. The quality of cream is poor.

Third, the reason why coffee is tasteless

1. Improper handling of filter cloth

2. Coffee beans are not properly stored and are too damp.

3. Time is too long.

Fourth, the reasons for the miscellaneous smell of coffee

1. Poor water quality

2. Improper handling of filter cloth

Five reasons why coffee tastes bitter and has no flavor

1. The coffee is ground with uneven thickness.

2. The cooking time is uneven.