When do eggs 'pip'?

Rorie

Chirping
7 Years
Apr 1, 2012
135
0
89
My incubator instructions say that when the eggs pip, i should raise the humidity of my incubator. However, i am sure i read that i should raise it on day 18. Do they pip on day 18? If not, what is correct thing to do?

Thanks
 

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