It is available through the internet and at most retail outlets where you buy your chicken feed. Try Co-op stores or any farm supply agents.
Egg yolk color of free range chickens can vary depending on their diet at the time. The more they eat green, orange, or yellow produce, the deeper orange the egg yolk will be. Egg yolk color can be dark orange but a black yolk means you have a spoiled egg.
it will turn or change the egg yolk a different color
The usual yolk colour ranges from light yellow to light orange. The breed of bird that lay the egg doesn't matter.
Xanthophyll, is the pigment that gives egg yolk it's color.
the color of the yolk
When hard boiling eggs which are not very fresh the yolk can migrate to the outer edges. If you want to keep the yolk in the centre of the egg, buy very fresh eggs! I buy mine direct from the farm.
I am assuming the egg was boiled. If the egg was boiled and peeled and a dark or grey coating was apparent surrounding the yolk, yes it is safe to eat. The discolouration is from iron and sulfur reacting to heat.
Yes, a chicken's diet will effect the color of the yolk. Things like greens, calendula, carrots, peppers, etc. will darken the yolk. Chickens who free range generally have darker yolks than ones kept in a pen.
Egg Yolk looking color in the back of the eye.
Because consumers expect consistency in the products they buy, the egg industry has formulated a yolk color chart and strives to maintain the bright yellow color of the fresh egg. They do this by adding natural pigmenting agents to the feed. Home grown chickens are often free range and enjoy a much varied diet, this influences the color of the yolk.
Yolk color is dependent on the diet of the hen; if the diet contains yellow/orange plant pigments known as xanthophylls, then they are deposited in the yolk, coloring it. Lutein is the most abundant pigment in egg yolk