Hard vitreous and non-vitreous kernels

Hard-vitreous kernels are kernels that have a natural translucent colouring which is an externally visible sign of hardness. Kernels that have a starch spot of any size are considered to be non-vitreous kernels. 

The following images show kernels that have been cut in half to allow a view of their interiors.

Numbers 1 -5 show kernels that are considered to be hard vitreous kernels. Number 6 is considered to be a non-vitreous kernel.

Images A, B, C, D and E are considered to be hard vitreous kernels. Each cut kernel has a cloudy interior.