Why egg shells staining yellow during hatch?

Alaskaduck

Songster
5 Years
May 1, 2017
64
19
101
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?
 
I think I'd have to take the whole egg out to get a decent picture. Hesitant to do that when they're piped.
 
5 progressing but they sure are slow...stressful. But tiny advances on zipping every few hours
 

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