I'm nearly finished my Nail Varnish Challenge! There's only about 3 or 4 left in my box, yay! This is The Serpentine from Nails Inc which described as a "muted navy slate" on their website, which I think is a perfect description. Although this is isn't a colour I'd normally wear - it's a bit dark - I do quite like it. However I found it shrunk quite a lot with Seche Vite and chipped even more quickly than normal on my nails! Despite this unfortunate occurrence, I think I'll hold onto this one, I do have one other navy but it's more shimmery so this is a bit different.