I let these two eggs incubate for at least several weeks despite the fact that they appeared infertile - just in case I was wrong! After a while, they stopped candling yellow and started candling deep orange, which, in this case meant that the liquid insides had solidified. So, just for fun, I cut them open to look at them.
But it got me wondering - do infertile reptile eggs (in this case, corn snake specifically) not contain a yolk? Why do infertile chicken eggs have a yolk?