The process
Wheat is harvested in the field,
so the quality can not be constantly uniform
as it is made in factories.
The quality of wheat changes according the land, kinds, and seasons,
and it is mixed with grass, soil, and mud, etc when it is harvested.
Possibly there might be sick wheat.
So, it is difficult to make good quality flour.
You need to remove unnecessary things
such as grass,soil,mud and sick wheat.
There are many steps until wheat becomes flour.
On this site, we will explain the process in four steps.