call duck candling

[Philbop2000]

I have hatchef calls a few times but have never candled during the incubation.

Today I did and found the image below with a dark embryo area. I thought this was a bit small for 18 days and wondered if anyone had any thoughts? (Most of them are the same)

 

[sonjab314]

Looks to be infertile to me

 

[Philbop2000]

The embry or yolk area is definitely darker/larger than an unincubated egg. Could my lamp be too bright?