Where the shape comes from
One account reads it as a person bent over another, sharing or taking on their feeling until it shows on the face — countenance as the visible trace of an inner state, which is how the character came to mean colour, any visible hue being the face a thing shows to the eye. It names complexion directly in 脸色, one’s look, one’s expression, and colour broadly in 颜色 and 色彩.
汉字 filed under 色
No published character on HSK Guide is filed under this radical yet. 汉字库.