Flint corn (Zea mays indurata; also known as Indian corn or sometimes calico corn) is a variant of maize (var. Linnaeus), the same species as common corn. Because each kernel has a hard outer layer to protect the soft endosperm, it is likened to being hard as flint; hence the name.The coloration of flint corn is often different from white and yellow dent corns, many of which were bred later. Most flint corn is multi-colored. Like the Linnaeus variant of maize, any kernel may contain the yellow pigment zeaxanthin but at more varying concentrations.