Ink is a really pretty purplish-blueish color. To me, it came out better in pics with flash than it even looks in really life. In person it was super dark and you really couldn't see much of the blue hue of it. I had a time applying it, for the simple fact that it was a mini that was a free gift with a purchase at Ulta. I'm not sure if I'd add the regular size to my collection, but it was definitely nice to at least be able to try it out.
Also, Ink, as you can tell from the pics has some shimmer in it, though it is not overwhelming. It does add that extra pop to the shade, making it stand apart from your typical dark purple.
The formula was pretty smooth, which it common with OPI polishes, so no surprises there. The top coat is the OPI top coat, which I do no fancy at all. I'll definitely use Seche Vite or ChG Fast Forward next time around. Nonetheless, it did give of a shiny look, it just didn't dry as well as Seche Vite or ChG Fast Forward.
All pics w/ flash