What makes it special: The delicate shine that comes with the mixture of black and dark blue. How long it lasts: I stayed with it for five days. During this period I was traveling, I used and I washed my hands a lot which naturally reflected in the nail polish being spoiled. Luckily during those days I kept my blue nail polish with me and I used it once or twice a day to repair the edges. Essence is not a lost lasting nail polish so keeping the bottle with me has always been crucial whenever I use it.