Halley's Comet is the second blue from the Orly Cosmic FX collection. It is described as a Turquoise with green yellow fx. It is definitely turquoise, and a lovely one. But I did not get much of the green yellow to come through on the nail.
With Halley's Comet I used Orly Bonder as my base, 3 coats of polish on all fingers, and Orly Polishield as my top coat. 3 coats were sufficient for this one as it is more opaque, but still a little streaky so be careful with application.
Another thing to look out for is a removal issue I found. With both clean up and full removal I had a big problem with Halley's Comet staining the skin around my nails blue. You can see it in the above pictures if you enlarge them and look closely.
I like the color a lot, but I am not a fan of the staining. It is also a familiar color and reminds me a lot of Zoya Charla, which you can see a swatch of here.
Disclaimer: The product(s) in this post were provided to me by the company for consideration.