egg viability questions

[itbites]

I know this has been done to death but I still can't find what I'm looking for!
Speaking of infertile(not dud) eggs...

Generally speaking how long does it take to determine they are in fact infertile after incubation?
Are there any signs in early stages after laying that can indicate that they are infertile..

Also with candling...
what are the stages where veins should be apparent (in cooler climate dragons)
after laying/incubation??

Cheers

 

[itbites]

no takers?...

 

[Chrisreptile]

Usually within a week you will notice mould building up, the egg becomes discoloured and will often shrink.

 

[funcouple]

you should be able to see veins when candling when the egg is about a week old.