Ok, he’s not truly white. He’s got just the faintest tint of yellow to his feathers.
He’s not albino, if he was he wouldn’t have the black feathers, and he’d have red eyes. Due to the faint gold tint he isn’t technically leucistic. So I’m wandering between a weird mutation and a diet problem causing him to grow in feathers in the lighter shade this year (we didn’t have an abnormally pale Goldfinch hanging around for the winter). But he’s still cool to look at!