Harvest mature corn kernels
Clean and sort the kernels
Soak the kernels in water
Grind the softened kernels into a slurry
Separate the starch from the fiber, germ, and protein
Let the starch settle in water
Drain off the water
Wash the starch with clean water
Dry the starch completely
Grind the dried starch into a fine powder
Sift the powder to remove lumps