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, yolk color is just an indicator of what the hen's diet was during the formation of the egg. It has the same nutritional values as a normal yolk.
green-brown on the outside yellow to red on the inside
Light brown on the outside and orange / yellow on the inside.
Inside yellow, outside brown gridded appearance with green stalks. Look at spongebob's house-LOL.
They actually look the same on the outside. But on the inside its a rubbery, opaque egg white color. Th yolk has a grayish brown colored outer layer and the inside can be a variance of bright yellow to an almost mustard yellow color.
Yellow.
Grell's eyes have dual iris', all Shinigami have the same colour of eyes. His eyes are yellow on the outside, and green on the inside.
the colour is mainly yellow
Pale yellow inside, green when unripe, browny-yellow when ripe
The color is red on the inside and the color is white on the outside.
it will change the color inside
Yellow on the inside and fusha (Darker pink color) around the edges.
Urochrome.