For a Calico, you will have a very good idea how white a hatching will be. They will have pink up the sides that turns white over a few months. The bigger they get then will give a impression of more white, but not change the actual ratio of white (if that makes sense). SO, in essence you know from the time they are a baby that they will or will not be high white. As for Spiders, I am not sure if that is the case.
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