This person also got chicks with black dots from crossing a White Leghorn ( who is dominant white) to a RIR. Though unlike RIWhites who are also dominant white, White Leghorns generally dont have silver genes.
https://www.backyardchickens.com/forum/viewtopic.php?id=381028
https://www.backyardchickens.com/forum/viewtopic.php?id=381028
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