Under a black light some eggs glowed orange, is that normal?

[katagra]

Button Eggs




Coturnix


I tried to google it, but I didn't find anything very quail specific.
Just something about brown egg shells containing Protoporphyrin IX.
I didn't have any brown chicken eggs to test,
but I saw a very faint orange glow on some turkey eggs.
Anybody know anything more about this?

 

[fiberdrunk]

That's so cool!