Plum foily duochrome
Metallic Mercury is one of a number of W7 polishes I picked up in TK Maxx last year for a bargain price. TK Maxx seemed to get a lot more nail polish in last year, long may it continue!
Metallic Mercury is a warm blackened plum foil with a hint of greeny gold duochrome. The duochrome isn't super obvious though.
Nice and opaque, swatch shown is 2 coats with no top coat. Application was good.
IIRC this is similar but not a total dupe to one of the Orly FX collection.