ILNP Hush (H) is a very cool-toned, medium-dark duochrome with a metallic finish. It is a permanent nail lacquer that retails for $12.50 and contains 0.4 oz.
ILNP Hush (H) Holographic Ultra Chrome Nail Polish ($12.50 for 0.4 oz.) has a black base with multichromatic shift that went from deep, bluish-teal to bluish-violet to purple to magenta paired with holographic micro-flakes. It had a noticeable shift in most lighting, though the shift itself wasn't quite as dramatic since a lot of it was between teal-violet and edges of warmer purple/magenta; I'd describe it has a moderate multichrome overall.
The consistency wasn't too thick or too thin, so it had good spread and dispersion of the shimmer/sparkle, but self-leveled and didn't take too long to dry down. I had just barely visible brush strokes on one or two nails in person. Per the brand, it has its maximum coverage in two coats. In the swatches, I've applied two coats and then one layer of Zoya Armor top coat (though I added Zoya Anchor as a base coat when I tested for longevity), which was enough for full opacity. I wore this shade for 10 days and had minor tip wear and no chips.
As a FYI, the brand offers this shade with and without holographic micro-flakes--shades designated with "(H") include the holographic micro-flakes.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Butyl Acetate, Ethyl Acetate, Nitrocellulose, Adipic Acid / Neopentyl Glycol / Trimellitic Anhydride Copolymer, Acetyl Tributyl Citrate, Isopropyl Alcohol, Stearalkonium Bentonite, Acrylates Copolymer, Styrene / Acrylates Copolymer, Silica, Benzophenone-1, Trimethylpentanediyl Dibenzoate MAY CONTAIN Titanium Dioxide (CI 77891), Iron Oxides (CI 77489, CI 77491, CI 77492, CI 77499), Red 6 (CI 15850), Red 7 (CI 15850), Red 34 (CI 15880), Yellow 5 (CI 19140), Blue 27 (CI 75510), Black 2 (CI 77266), Mica, Aluminum Powder (CI 77000)
Disclaimer: Ingredient lists are as available by the brand (or retailer) at the time of publishing. Please always check product packaging, if it exists, for the ingredient list applicable to the product you're purchasing, or the brand or retailer's website for the most up-to-date ingredient list.