Identifying specific hens eggs with food color, experience?

sarahannecloud9

Chirping
May 22, 2012
140
4
83
Pleasant Hill, Tn
My Coop
My Coop
I have a mixed flock of hens, only wanting cochin eggs to hatch. I have some I don't think are laying as well. I was told of the food coloring method. Also it will last up to 7 days. I have no clue where to get pipettes? Also looking for others with experience please? Tips?

TIA!!
 
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