Just an update. I checked with a fellow backyarder and here is what he says about California Whites.
The california white s have the wrong E locus to be sex linked so they can not be color sexed at hatch. The california gray is semi-autosexing. You can sex cali grays-like you do barred...
However since they may carry recessive white, they can throw white sports
Like I said they don't breed true.
And they are not autosexing. Look it up on feathersite.
foxflower: You know that these are not a true breed? When breed together you'll get a good number of purewhite chicks and some with barely any black on them at all, and some that look like the parents.
California Gray or Production Black were a cross of White Leghorns Roosters over Barred Rock Hens.
They take a California Gray and corss it back over White Leghorn hens to create the California Whites.