You are not seeing many high whites available right now because they have been sold. You will likely have to wait until the 2012's hatch and look for one with a lot of pink that will turn white. If you really want a lot of white, look into a Sugar.
The white will not spread beyond what is pink/white when they are babies. I agree that the consensus seems to be you can get high whites out of low whites and that is amplified if you put it into another animal that is already high white.
When the white does come in it is VERY white. I have a Calico Spider and her white are super bright. Pied bright.
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