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The DSM Yolk Color Fan is a 16-scale color index that distinguishes yolk color and is widely used in the poultry industry. Under the scale, each number corresponds with a different shade.
The color of an egg yolk is entirely dependent upon a hen's diet, an expert said. A diet with more carotenes and xanthophylls will produce a darker yolk.
For example, the yellow color of chicken egg yolks, fat, and skin comes from ingested xanthophylls—primarily lutein, which is added to chicken feed for this purpose. The yellow color of the macula lutea (literally, yellow spot ) in the retina of the human eye results from the presence of lutein and zeaxanthin .
The yolk of the eggs have not yet fully solidified. Eggs contain multiple proteins that gel at different temperatures within the yolk and the white, and the temperature determines the gelling time. Egg yolk becomes a gel, or solidifies, between 61 and 70 °C (142 and 158 °F). Egg white gels at different temperatures: 60 to 73 °C (140 to 163 °F).
The yolk of a chicken egg Diagram of a fish egg; the yolk is the area which is marked 'C'. Among animals which produce eggs, the yolk (/ ˈ j oʊ k /; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo.
The gases react with the iron and that turns the surface of the yolk a greenish grayish color." Older eggs can also be more prone to cooking up with green yolks. Steele says that as an egg ages ...
Mesolecithal eggs have comparatively more yolk than the microlecithal eggs. The yolk is concentrated in one part of the egg (the vegetal pole), with the cell nucleus and most of the cytoplasm in the other (the animal pole). The cell cleavage is uneven, and mainly concentrated in the cytoplasma-rich animal pole. [3]
The 6-minute egg has an almost creamy yolk, and the whites aren't too tough and rubbery. The 8-minute egg has a fully cooked yolk, but it's not as dry and crumbly as the yolk of the 11-minute egg.