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I had heard that too. I thought it was true until we found out we had two roos. I asked the people at the hatchery and they just laughed and said that they can't be sexed that way.
Not by leg color alone, no. I never say that. Always take the three traits together. The cockerel in the pic above has very little black. Some have none. I've never seen a cockerel start out with very black leg fronts.
If you follow speckledhen's advice you can sex pretty acurately. Mine are 3 weeks old and for sure 4 roos and 2 hens. Watch the development. The roos will lighten up almost to a silvery color before barring and the hens will stay dark.