yes mine get darker. As the chick gets bigger. And then I worry. 

i tested them .
the way i think celtic told me?
with the salt and bag,.
and used the one that was less off
haha
do yours get darker as they go ?
its day 10 for the scovies and the are starting to darken not the shell. like inside. maybe its the veining not letting as much light get through?
im anxious about the pekin eggs.
2 eggs is not great odd, but if i only get 2 chicks out of it i will be happy.
bcuz i know its nothing i could help,. they just didnt develope.