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Some black chickens may carry the lavender gene, which is sometimes called "self blue," but RoostersAreAwesome makes a very good point about how the blue gene behaves.

I'm guessing it's the recessive white gene causing this. Each parent can have one copy of the gene and you'd never know, but if a chick gets a copy from each parent (making two total copies of the gene), then the chick will be white.