Minor defects means that the peanut kernel is not damaged but is affected by one or more of the following:
(a) Skin discoloration which is dark brown, dark gray, dark blue or black and covers more than one-fourth of the surface;
(b) Flesh discoloration which is darker than a light yellow color or consists of more than a slight yellow pitting of the flesh;
(c) Sprout extending more than one-eighth of an inch from the tip of the kernel; and,
(d) Dirt when the surface of the kernel is distinctly dirty, and its appearance is materially affected.