Shell

 

 

Shell
Shell
Española: Concha, oreja,
Français: Coquille (dite “Oreille”)
Shells are a Secondary (Category 2) defect: 5 beans = 1 full defect
Shells are malformed, hollow beans and consist of an inner compact molar and an outer hollow part (the shell), either loosely joint or separated.
 One or both pieces may be found and in some instances they will be joined, in which case it does not count as a defect. The outer section has a seashell shape. The inner section may be conical or cylindrical.   Note: TWO MATCHING PIECES FOUND SEPARATE ARE TO BE RECORDED AS ONE DEFECTIVE BEAN.
Cup:Although not known to have an off-flavor, shell beans may roast unevenly and char due to low density, producing burnt flavors
Consideration:May cause uneven roasting
Cause(s):AGRICULTURAL: This is a naturally occurring phenomena, caused by genetics; however, old and undernourished trees may produce more deformed beans, including so-called elephant beans, of which part becomes a shell.
Remedies:AGRICULTURAL: At planting, select varieties with less than 7% deformed beans.
PROCESSING: At the dry mill, size sorters may separate elephant beans and split shells, which are further separated by a density sorter.