When many friends buy coffee beans, they find that there are always some English letters on the store's bean list, such as G 1, G2, SHB, SUP, AA and so on, which represent the grade of coffee beans. There are many ways to classify coffee, which can be distinguished from the size, hardness and altitude of beans. Each region or country has its own grading system. Today, we will mainly talk about the grading system of defective beans in Ethiopia.

Ethiopia's grading system is based on the number of defective beans per 300 grams of raw beans, as follows: Grade: number of defective beans.

G 1 grade: 0~3 pieces.

G2 grade: 4~ 12.

G3 grade: 13~25.

Grade G4: 26~45.

GS grade: 46~90.

This grading system is five-level universal.

In early Egypt, the traditional drying method was used, which left many defective beans, even stones and branches. Later, the improved water washing method has a procedure for selecting floating beans, that is, picking out the beans that float badly on the water.

Therefore, in the early stage, only washed beans can achieve G 1 or G2 grade, and dried beans are generally below Grade 3. However, with the improvement of people's requirements for coffee quality and the improvement of sun-drying technology, the quality of sun-dried beans is also improving year by year.