One of the OGs in the indie world for amazing duochrome (which is more like crazy-million chrome) is Tonic Peacock Parade. You can easily see the blue and purple on the nail but there's so much more going on in this polish as you can see above.
I started with Duri Rejuvacote, 2 coats of polish and finished with cuccio High Gloss Top Coat. This polish applied like a dream.
Here you can see the blue leaning turquoise and some purple on the edges.
Here's a better angle of the purple. I couldn't get the gold and red on camera but at extra angles, you can see that too!
Tonic is no longer available for sale.
