I can't really tell what color it is. I've gotten a blue or silver partridge (it's only a few days old) and another light color (the chick was trampled right after hatching) from a white cockerel in a pen with two paints and a silver white showgirl. The rooster was the one I bought from Jean when we were at her place. They've not hatched any others so far. I've been told that white can be like a lab coat that is put on over regular clothing, thus hiding other colors. Of course, it's also my understanding that whites that have had only white in their background for many generations are pure white.
I think paint is still not clearly understood, so there could be something from that mix.