White black brown yellow or any color is not an ethic identity it maybe a way to identify someone in lighter or darker skin but really Asian is Asian never seen a yellow Asian before
This comes from again the yellow River of China this was maybe when someone asked where are you from it was translated or written Yellow for the yellow River this was like the sun or gold as it produces most of the ag in China and supports large population.
Brown is a description of someone maybe is all someone tan could seem more brown then usual… ok