I also had a very good hatch this week from some greenfire French black copper marans eggs that I bought from a farm in Texas and had shipped to me. Out of 16 eggs, I have 12 beautiful chicks. One of them is yellow with some silver highlights. Everyone else was black with some yellow/white highlights.
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This is my first time ever hatching this breed and I didn’t expect a yellow one. The seller told me that it is a “snowbird” and that they tend to happen during winter. She also told me that when it matures that it will be solid white and if it is a hen that she will lay the dark colored eggs that marans are known for. Hoping that it’s a little pullet. I will post pics as it matures. Hopefully this will be helpful to those out there with questions about these little anomalies.