All about silkies
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The combs and wattles — lobes of skin that hang from a chicken's head — of a male silkie generally will be larger than the females at a fairly early age. The difference can show up as early as 8 to 12 weeks. However, not all males have a large comb or wattle and they may be mislabeled as a female until they begin to crow on a regular basis.
Many silkie owners point to the distinctive crest of feathers on the top of the head. A female will have a rounded crest, almost in a globe shape. The silkie male will have streamers of longer feathers that stream backward from the lower part of the crest. These streamers are one of the first things an experienced silkie owner will look for to distinguish it from the female.
The short answer to your question is no one knows. The only way to find out is to breed them together and see what comes of it (unless you know your whites background and exactly what went into breeding it). I have 2 white hens in my blue pen. They came from my blue pen and when paired with other birds that don't carry white, they throw blue, black and splash. When paired with birds that carry white, I get blue, black, splash and white
Nope, I don't do anything special for mine. When it rains, they go out and toodle around (and get soaked-they look pitiful, like drowned rats). Just give them a dry, draft free (but well ventilated coop) and they'll do just fine. I don't let mine free range, that's about the only thing they're limited on. They're always the first to be picked off by predators