Nucleus shifts from a plum purple to a dusty teal. The formula is thin, and you'll need at least three coats for the color to be opaque. Like with most Cameleon polishes, you'll get brush strokes showing. I don't know what it is about their formula, but I've never worn their polish and not have brush strokes show. It's frustrating, but a good top coat does even out the color a bit. Nucleus also has a tendency to bubble if you don't let it completely dry before adding another coat. Considering how cheap and pretty they are, I can live with the bad formula, though.
For my pics I applied three coats of Nucleus over a coat of Seche Vite. I also applied on coat of the Seche top coat to try and even out the streaks a bit.