I often do marker color keys of scenes to give my painters. I can't paint, so markers are easy for me to dash out.
They tend to fade in color over the years though, and I had a heck of a time trying to get the colors to scan right. They also look different on every computer screen I checked, so who knows what colors you'll see.
This one is from my Bjork video and the colors here look much less saturated than in the original. I tried 2 adjustments and neither one is exactly right.
Makes it hard to discuss color theories.
More to come...