One time on Usenet, Nancy2 <nancy-dooley@uiowa.edu> said:
>
> > Yup -- if you boil them, they can turn green...
> >
> > --
> > Jani in WA
>
> They only turn grayish around the edges of the yolk if you overcook
> them. It isn't the boiling, it's the cooking time.

Sorry Nancy, but I don't agree. I used to try boiling them shorter
and shorter amounts of time, and would often get green (yes, green)
yolks or they'd still be gooey in the center. I got used to the
green until Nancy Young told me to get them boiling hot and take
them off the heat. Now I get perfect, yellow hard-cooked yolks
every time, thanks to the lovely Ms. Young... :-)

--
Jani in WA