(1) Outline slightly defined (AA quality). A yolk outline that is indistinctly indicated and appears to blend into the surrounding white as the egg is twirled.

(2) Outline fairly well defined (A quality). A yolk outline that is discernible but not clearly outlined as the egg is twirled.

(3) Outline plainly visible (B quality). A yolk outline that is clearly visible as a dark shadow when the egg is twirled.

(4) Enlarged and flattened (B quality). A yolk in which the yolk membranes and tissues have weakened and/or moisture has been absorbed from the white to such an extent that the yolk appears definitely enlarged and flat.

(5) Practically free from defects (AA quality or A quality). A yolk that shows no germ development but may show other very slight defects on its surface.

(6) Serious defects (B quality). A yolk that shows well developed spots or areas and other serious defects, such as olive yolks, which do not render the egg inedible.

(7) Clearly visible germ development (B quality). A development of the germ spot on the yolk of a fertile egg that has progressed to a point where it is plainly visible as a definite circular area or spot with no blood in evidence.

(8) Blood due to germ development. Blood caused by development of the germ in a fertile egg to the point where it is visible as definite lines or as a blood ring. Such an egg is classified as inedible.