A defective variety of coffee beans.

Raw beans are divided into several grades according to quality standards, which vary from place to place, basically according to size and shape. The higher the grade, the better the quality. At present, as the domestic coffee raw bean market has just started, the coffee raw beans sold are mainly low-grade futures beans. People usually have a lot of defects in the raw beans they get. Defective coffee beans are quite harmful, including

Mutant bean

It is neither flat bean nor garden bean. Due to abnormal development, the raw bean is broken in the center when shelling. This kind of bean is prone to uneven baking.

Fermented bean / black bean

In the process of processing or washing, the beans are fermented internally. It has the smell of fermented acid.

Unripe beans / white dead beans

Coffee fruits are harvested before they are fully ripe. This kind of bean is ivory after baking and tastes green and astringent.

Moldy bean

The process of processing and transportation is affected by moisture, rain and mold. As long as one bean is moldy, it will soon spread to others, so be careful.

Moth-eaten bean

It is eroded by a pest called coffee bark beetle, and there are worm eyes on the beans, making the coffee smell.

Dried fruit

Bring the outer skin into the drying process. In the non-washing process, the raw beans can be removed from the shell, but in the water washing process, this state becomes defective beans.

Dissimilar bean

For example, robusta mixed with Arabica and flat beans mixed with garden beans.

Small gravel

Easy to break the bean grinder, more extensive sun can be found. When selecting, we spread out the beans and put them in a place with plenty of light, and it is more efficient to pick them with both hands. Basically, coffee raw beans that look uncomfortable can be picked out. After choosing neat beans, the beans can be baked more neatly and tasted more pure. If you mix too many unexpected factors, it is impossible to judge the real taste of the coffee bean itself. General commercial grade of ordinary coffee raw beans, through their own selection, can also reach a very high and expensive level, or even the level of refined coffee.