Gold based blues?? Whaaaat? You just blew my mind

everything I thought I knew has just been blown to smitherins


if you could be so kind to explain this I would REALLY appreciate it! Please explain it like you’re talking to a kindergartener because I am definitely not keen on genetics and how the coloring works

I’m trying to learn though! I just assumed blues were bred with blues and would make blues lol I’m just confused on how the gold would come into play lol or could it have been that the black roo (used to breed with the blue hen to make the splash) was bred from a gold based hen/roo and a black hen/roo? I’m a taaaad confused lol