I got a paint sample in the mail today from the guy who is going to paint the tank and seat unit. It turns out that flake paint is not like ordinary paint in the sense that you can mix in some other colour in order to change the shade – like add a bit of white to turn a blue colour into light blue. Instead, it's the small flakes themselves that are coloured. So in order to change the hue of the finished paint, you have to use different background colours "behind" the flakes. The left part of the paint sample was painted red before the flakes were applied, and the right part was painted black. As a result the right part of the sample looks darker from some angles, but not all (you cant really see the black base paint). From straight on it's hard to tell the difference, but from a more oblique angle the difference is clear. I really like the "red flake on black background"-colour. It looks a bit like the old Husqvarna "Ruby red" paint (image here). I think I'm going for that as the base colour.