Eking Out a Rainbow

About two months ago, delving back into one peculiarity of pushing the home computers of the 1980s to their limits, I ran into a grand yet casual claim about just how far the “artifact colours” of the Radio Shack Color Computer could be stretched. A trifle dubious to start with, I was then distracted by some simpler experiments in getting images using a more familiar and limited palette onto a(n emulated) “CoCo” screen. Still, I did keep pondering the suggestion it was possible, with just the right arrangement of black and white, to go all the way from “orange” and “blue” to “green” (a colour more familiar from that computer’s text mode).
( Stretching things along )