As is the modern invention of ancient white marble statues: https://www.metmuseum.org/perspectives/videos/2022/7/spotlig...
You can clearly see leftover pigments, grains of dirt, and various other undertones when you look closely at any museum with these statues. They clearly are nowhere near a pure white colour, without any exception that I've seen.
Of course those folks who don't care enough to pay attention might believe in such a myth, but why try to convince folks that don't care?