NARS Insidious is a very warm-toned, very dark green with a pearl finish. It is a limited edition nail lacquer that retails for $20.00 and contains 0.5 oz.
NARS Insidious Nail Polish ($20.00 for 0.50 fl. oz.) is described as a "black bronze." It's a deep, dark olive brown with murky gold and bronze pearl. It was intensely pigmented and was nearly opaque in one coat, though I applied two for swatches. The formula wasn't too thick or too thin, so it applied beautifully and didn't streak, bubble, or pool along the edge of the nails. I don't think this looks like NARS Mash, which is much greener, less olive/brown, but it was a shade I had in mind initially. Chanel Mysterious (601) (P, $27.00) has no shimmer. Rescue Beauty Lounge Scrangie 2.0 (LE, $20.00) is more shimmery, lighter. Dior Czarina Gold (LE, $24.00) has larger shimmer. SpaRitual Lithophonic (LE, $10.00) is greener. China Glaze Midtown Magic (LE, $7.50) is browner. See comparison swatches / view dupes.
Continuing with the same hues that have made NARS Nail Polish a coveted favorite, NARS introduces a new technology to its Nail Polish, specifically designed to help improve the formula's flexibility, durability, wear and gloss properties. NARS reintroduces its Nail Polish with a newly developed polymer system that provides extended wear and a tough, durable, chip-resistant finish. The superior longwearing formula also imparts an initial high-gloss luster with prolonged gloss retention, and is also water and detergent resistant with additional UV protection to prevent polish discoloration.