I Know is a deep metallic magenta holo with blue microglitter in it. Because it is more metallic in nature, it does want to leave streaks when you have excess polish on your brush/nail, but they are pretty easy to take care of. The formula was a little bit on the thick side, but not bad. It was pretty easy to apply in general, though I think it did thicken up a bit as I was using it. Still, it went on easily enough. My only quibble is that it dried a little bumpy looking, either because of the microglitter or maybe my coats were too thick (I think it's the microglitter but maybe someone has a better explanation). It's a small quibble. I used three coats in all, though I feel like you could probably get away with two.
I think I Know is just gorgeous. For some reason, to me, this color just works for the quote. I'm not quite sure why that is, because this isn't a color that's prevalent in the movie at all. Maybe it's because it's a romantic color, but not totally traditional? We'll go with that. I love how deep and rich it is, and the blue microglitter gives it some added depth and interest. It feels right!