What are defective beans? Reasons for the formation of defective types of raw beans

What are defective beans?

Coffee raw beans are often mixed with impurities and bad beans, which are what we usually call "defective beans".

Defective types of raw beans

● all-black bean (FullBlack)

◎ features: whole or local raw beans appear black and opaque.

The reason for the formation of ◎: blackening is caused by excessive fermentation, such as fermentation or smelly, dusty odor, mildew and decay.

● whole sour beans. Local sour bean (FullSour.Partial Sour)

◎ characteristics: beans are considered sour beans when they are yellowish brown or reddish brown.

The reason for the formation of ◎: sour beans are contaminated by bacteria in the process of harvest and treatment.

● mildew damage bean (FungusDamage)

◎ characteristics: yellow-brown and reddish-brown spots in the early stage of mildew-damaged beans indicated that they were eroded by irritant spores.

The reason for the formation of ◎: mildew damage to beans is usually due to the presence of mold spores on beans, which will cause mold to grow and infect beans when stored at a certain temperature and humidity after harvest.

● borer bean (Insectdamage)

◎ features: small black holes 0.3-1.smm in diameter, usually on the inside of coffee beans.

The reason for the formation of ◎: in coffee agriculture, insect pests are the most serious, while the fruit is still on the tree, the worm has already drilled into the fruit to breed.

● broken bean (Brokenbean)

◎ characteristics: broken beans usually have a dark red area due to oxidation.

Cause of ◎ formation: broken beans usually break when dealing with pulp or dry processing, incorrectly correcting the machine and excessive friction or extrusion.

● immature bean (Immature bean)

◎ characteristics: immature beans can be distinguished by the pale and yellowish green skin or the white spots of the skin.

Reasons for the formation of ◎: there are many reasons for not fully maturing, inappropriate harvesting of immature fruits and berries that are too late for ripening at higher elevations.

● deformed bean (Deformitybeans)

◎ features: abnormal shape, off-center incision slightly enlarged.

The cause of ◎ formation: growth defects, physiological factors.

● shell (Shell)

◎ features: shell beans are separated and deformed from the inside or outside at the same time.

The reason for the formation of ◎ is mainly due to genetic variation.

● floating bean (Floater)

◎ features: the appearance of floating beans is particularly white or faded, while raw beans will have spots.

Cause of ◎ formation: for processing, this disadvantage is caused by improper storage or drying, which usually leads to discoloration or low bean density.