*nods* Lots of good points.
I <3 FARP. :)
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To help illustrate what I mean: http://i144.photobucket.com/albums/r195/YargoPlatz/yargo_badge_03.jpg
There are multiple highlights that are done in CP, as far as I can tell. I've SEEN others do it as well. This I believe is marker.
I think a part of the idea is to tint the paper with a layer of color, so that the paper itself is "dyed". Then to go back over it with a lighter color. The CP should, by this thinking, be picked up by the texture of the paper itself and show over the base color.
IE: If it works on colored paper, it should work on "dyed" paper that has been colored with marker or watercolor.
I used watercolor as a base, to give the white paper a middle-value. The sky in the background is 95% watercolor, blue. Nothing else. The spotting actually comes from lifting some of the color up and off of it, letting it dry a bit, then adding a bit more color (with more water rather then more color).
The patches of "burnished whitish kinda color" that signify the cloud highlights is in fact the 5% that is CP. Look to the right (viewer's right) of the butterfly. It 's more visible on the very dark of the blue. If you look to the left in the lighter areas, you can just make it out.
I had tried to do a light layer-on-layer with soft, light, pencil strokes. But that didn't do anything. I had to press more, and thus ended up with the more burnished look instead.
With watercolor AND CP one needs to work light to dark, that much I understand. ;)
As for adding other media. Because of their level of opaque-ness, other media is used for adding smaller details without causing CP "bloom" from over working the CP. It sticks to the CP.