White Dent Corn - from the Commodity Image Gallery

White food corn hybrids are dent corn with specific starch properties typically contracted and sold to dry-mill processors and used in alkaline cooking processes for making masa, tortilla chips, snack foods, and grits. White food grade has a limited wet milling use for food grade starch and paper uses.

Dent corn is standardized under the U.S. Standards for Corn.

USDA - GIPSA
http://archive.gipsa.usda.gov/tech-servsup/visualref/grain_gallery/HTML%20Pages/whitedent.html