New Sultan Chicks but What Happened?
While sometimes a surprise recessive white will pop up from black parents, it doesn't happen in reverse. This chick is likely what some call a silver gene white. They are greyish as chicks but are pure white as adults.
For example take this little grey chick in the center of all the yellow ones. The lighting makes him look darker than he was, it was a silvery color.
And as an adult