The shell must be unbroken and may be slightly abnormal and may show slight stains but no adhering dirt, provided that the stains do not appreciably detract from the appearance of the egg. When the stain is localized, approximately 1/32 of the shell surface may be slightly stained, and when the slightly stained areas are scattered, approximately 1/16 of the shell surface may be slightly stained. The air cell may not exceed 3/8 inch in depth, may show unlimited movement, and may be free or bubbly. The white must be clear and may be slightly weak so the yolk outline is well defined when the egg is twirled before the candling light. The yolk may appear slightly enlarged and slightly flattened and may show other definite, but not serious, defects.