Colored aleurone C1: Dominant purple or red aleurone vs c1; recessive colorless aleurone. C1-I; Dominant colorless vs C1, colored aleurone. c1-p; colorless aleurone with light inducible pigment.
MaizeGDB reference

Colored aleurone Colored vs. colorless aleurone Alleles: Bottom selfed ear shows a 3 colorless to 1 colored ratio segregating C1-I/C1. Top ear shows 3 colored to 1 colorless segregating C1/c1. Note C1-I/C1/C1 kernels are dark pale, and C1/c1-I/c1-I kernels are light pale (c1c1c1 is colorless aleurone, C1-I is a dominant inhibitor of C1 color)