setpalette
SETPALETTE colornumber rgblist
sets the actual color corresponding to a given number, if allowed by
the hardware and operating system. Colornumber must be an integer
greater than or equal to 8. (Logo tries to keep the first 8 colors
constant.) The second input is a list of three nonnegative numbers
less than 100 specifying the percent saturation of red, green, and
blue in the desired color.