I would say Hawaii is a pastel pink neon if there's such a thing lol. As you can see, there are four layers of colour in the bottle but only the pink shows up with occasional streaks of orangey yellow when applied on the nails. The formula is a little on the thick side and I had to apply three coats to cover up all the sheer spots.
I picked up this polish while shopping with a friend at the mall a few months ago. When he saw this and all the other Mixables, he was really surprised to find out that the different layers were not mixed together and asked me how they did it. I was like "Er...how am I supposed to know? YOU'RE the Chemistry major!" And then he went on trying to explain it in all these scientific terms that made no sense to me obviously. =P But I think it's something along the lines of um.... the layers of polish have different densities so diffusion will not be able to take place; therefore, they will not mix together unless you want to destroy the layers and physically stir it or shake it yourself. Kinda interesting eh? ; )