Stage 11.1 (Milk Stage): Kernal fluid is milky white from the accumulating starch.
Stage 11.2 (Dough Stage): Kernel contents are soft and dry (doughy) as starch accumulation continues. The plant leaves and stems are yellow.
Stage 11.3: The kernel is hard, difficult to divide with the thumbnail.
Stage 11.4: The kernel is ripe for cutting. It fragments when crushed. The plant is dry and brittle.