Im using Maybeline's colorama black, and two coats of Depend 363. In bottle it is clear/milky polish with loads of blue/greenish, and purple/pink shimmer to it.
Depend on light color goes from turquoise, electric blue, green to deep purple! It's magic in bottle. I couldn't capture purple tones and the accurate color in bottle so here is link to beautiful pictures taken by ClawsInColor.
I haven't tried it over white base, or even without base, but I spouse that it wouldn't be so effective as on top of darker color.
When I first saw it it reminded me of unicorn tears, and there was no doubt about buying it.