The term "eggyolk is associated with a named marble. "Oxblood and Egg Yolk".
Akro has a nice deep, thick yellow, that as an individual you could call "eggyolk yellow". It was no doubt used in a variety of Akro Agates.
In this case--I would call it yellow and a nice corkscrew regardless of the damage. I keep them and display them all.
I would not discount this one being a "well filled" "Popeye".
Popeyes come in a variety of shades and depths regardless of the color combo.
Corkscrews--On!!