Why egg shells staining yellow during hatch?

Alaskaduck

Chirping
May 1, 2017
62
14
71
Hello, today is day 28 and 4 of my 8 duck eggs externally piped today. On some of them, the pointy end is turning yellow on the outside. Is that normal?
 

BlossomChicks

In the Brooder
Apr 11, 2017
1
0
11
Same here on call duck eggs that are 28 days today too. Not yellow but a bit darker above air sack line.
 

Alaskaduck

Chirping
May 1, 2017
62
14
71
I think I'd have to take the whole egg out to get a decent picture. Hesitant to do that when they're piped.
 

Alaskaduck

Chirping
May 1, 2017
62
14
71
5 progressing but they sure are slow...stressful. But tiny advances on zipping every few hours
 

Alaskaduck

Chirping
May 1, 2017
62
14
71
Same here on call duck eggs that are 28 days today too. Not yellow but a bit darker above air sack line.
Interesting, the staining I see is in pointy end. But the ones that have piped are slowly, so slowly progressing.
 

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