This kit released around the same time as the OPI Color Paints and the Essie Watercolors. These polishes are highly pigmented, watery colors that are translucent; they're meant to be applied over a base color, most often a silver, and because they are so watery and pigmented you can easily create watercolor-esque designs - especially ombre effects!
And that's my first impression of the Formula X Infinite Ombre Nail Kit! This is a very interesting kit; I'm sad the watercolor/painting trend was so short lived. With a little creativity, you could do some pretty amazing things with these polishes. The original $25-$30 price for this kit was a little steep, but it's a steal at the sale price! If you can find this kit at your local Sephora or Sephora in JCP, I would recommend picking it up and giving it a try.
Thanks for reading! <3