Why not print the rainbow roll first? I could have done that, but again, if the purple or pink had showed up anywhere on the movie screen, it would have looked like moths had eaten through the picture to reveal the sky behind it. Not what I wanted.
So, with two blues and two yellows ahead, I need to plot out my colors carefully. The ink is laying down very nice, so I'm not concerned about coverage too much at this point. If there was another gray on the agenda, I might be tempted to print that next just to give me a clean base on which to build the cars. But there is not a gray. But there is a dark red, and I have chosen to use the dark red as my base. On the dark red will sit a dark blue. The dark blue will support the light blue on top. In an odd choice, but one that works, will be a dark yellow (which will have a greenish tone). Then a lighter yellow on top of that.
The key to a vibrant reduction print is understanding color and how to use the colors underneath to the best advantage of the colors on top.