The formula is thin and definitely takes many coats to build up. I used 3 coats in these photos and if I recall correctly, it takes about 5 to achieve an opaque look. I use this type of polish generally as a topcoat over glitter shades. It softens the looks somewhat and seems to slightly meld the glitter together. The Essie tinted polishes also have a super high-gloss finish.
Above & Below: Night Cap is a cadet blue that leans toward teal in brighter lighting (above) and appears to have more of a grey/blue hue in lower lighting (below). I don't know how many of these tinted shades Essie has made, but I do have a purple/burgundy one called Grape Crush that I bought years ago at the same time I bought Night Cap. I also have a red one in my collection, although the name escapes me and I don't even remember buying it!
Below: You can see by this bottle picture how thin the formula is and the deep blue tinted color.
Below: Here's my look for the day--it's dark, cloudy, raining and very gloomy today, so I applied a coat of China Glaze Cracked Concrete over Essie Night Cap. I think it reflects today's weather pretty well!
If you're a fan of old school Essie and particularly the older tinted water-type polishes, I'm going to offer my extra bottle of Night Cap to one follower by using random.org. Just leave your eMail below in the comments. I'll leave the entry period open until midnight Sunday, March 27. The winner will be announced on Monday in my Come Monday weekly newsletter.