set-face-foreground
set-face-foreground is an interactive compiled Lisp function in `faces.el
'.
(set-face-foreground FACE COLOR &optional FRAME)
Change the foreground color of face FACE to COLOR (a string).
FRAME nil or not specified means change face on all frames.
COLOR can be a system-defined color name (see `list-colors-display')
or a hex spec of the form #RRGGBB.
When called interactively, prompts for the face and color.