Formula X A Little Sexy Nail Lacquer ($10.50 for 0.40 fl. oz.) is described as a “pearl light periwinkle.” It’s a softened, medium-dark periwinkle blue with a metallic finish. It was opaque in a single coat (which is what is shown in the swatches), but the consistency is noticeably thick. The metallic finish is very unforgiving if you don’t let it completely dry on the first coat before applying additional coats, and it tends to look best with a single coat, because it has the least amount of visible brush strokes. Illamasqua Cameo (P, $17.00) is brighter, no shimmer (cream). Chanel Sky Line (LE, $27.00) is much lighter but had a metallic finish/slight muted quality to it. China Glaze Modify (LE, $7.50) is similar without a top coat. See comparison swatches / view dupes.

Formula X Inspiring Nail Lacquer ($10.50 for 0.40 fl. oz.) is described as a “pearl light turquoise.” It’s a light-medium, aqua-teal with a metallic finish. This was mostly opaque after a single coat, and it looked the best with one coat of polish as the consistency was also on the thicker end of the spectrum, which made minimizing brush strokes difficult if you had more than one coat. I also had slight bubbling on two nails. Essie Naughty Nautical (LE, $8.00) is greener, darker. MAC Salad Dressed (LE, $16.00) is darker, more muted, less shimmery. Illamasqua Venous (LE, $17.00) is darker, less shimmery. Dior St. Tropez (LE, $24.00) is slightly darker, less shimmery. Zoya Zuza (P, $9.00) is darker, more shimmery. See comparison swatches / view dupes.

Formula X A Little Sexy Nail Lacquer

Formula X A Little Sexy Nail Lacquer

Formula X A Little Sexy Nail Lacquer

Formula X A Little Sexy Nail Lacquer

Formula X A Little Sexy Nail Lacquer

Formula X A Little Sexy Nail Lacquer

Formula X A Little Sexy Nail Lacquer

Formula X Inspiring Nail Lacquer

Formula X Inspiring Nail Lacquer

Formula X Inspiring Nail Lacquer

Formula X Inspiring Nail Lacquer

Formula X Inspiring Nail Lacquer

Formula X Inspiring Nail Lacquer

Formula X Inspiring Nail Lacquer