Guess I'm coming back to my old self, darker polishes it is :)
Today I have a real beauty for you, Innisfree 103. It has a purple base with loads of red glass flecks, that shift to orange and gold. It's also very pigmented, you probably could get away with one thicker coat.
Unfortunately the duochrome effect doesn't really show all that much on nails that it does in the bottle. Still a very pretty red <3 It would probably looked really awesome sponged only on tips over black base.
Thanks for stopping by**