Colorblind² is a sister to Colorblind, a polish made up of small black and white round glitter pieces in a clear base. Colorblind² (squared) is the same polish, but with square glitter pieces. For the record, I think the name is genius :-)
My bottle of Colorblind² came with a wonky brush, so application was tedious. Sandy at Dandy Nails is sending me a new one though, so all is well. By the way, Sandy responded to my email pretty much instantly and offered to send a replacement brush free of charge. She's amazing at customer service!
Colorblind² is a lot more dense than I thought - I only needed two coats to get the coverage in my pics. I really like that I don't have to apply four coats to get decent glitter coverage, like with some indie brands. No fishing for glitter here!
Here's two coats of Colorblind², layered over two coats of NYC Sidewalkers, topped with Seche: