There's a saying that "One drop of poison infects the whole tun of wine", it is thought that one flawed coffee bean affect a whole cup of coffee a lot. coffee valve would like to tell you that flawed coffee beans can be classified into eight categories.
1. unripe coffee beans
Unripe coffee beans are picked by the peasants from the unripe coffee cherries and processed, a cup of coffee brewed with unripe coffee beans has odd acid and bitter taste.
2. moldy coffee beans
Moldy coffee beans are the coffee becoming damped during delivery and storage.
3.fermented coffee beans
Coffee is fermented while being washed process, it will extremely influence the original flavor of coffee.
4. coffee beans infested by pests.
Because coffee cherries are infested by pests, the coffee beans can be seen some pests.
5.cracked coffee beans
During being roasted, coffee beans can be heated evenly,and it affects the exterior of coffee beans.
6. Shell-like coffee beans
The shape is like shell which is kind of wired, their bodies evaginate like shells.
7. Coffee beans with hulls
Because of the inappropriate processing method, the silverskin is not removed.
8. lifeless coffee beans
The coffee beans can not normally crop. It is hard to roast lifeless coffee beans, because their color will not change easily even after being roasted.