Power Clutch is from Essie’s Fall 2011 collection. The color is described as a “striking, deep gray-green”, which is exactly what you get in the bottle and on the nail. The color can lean more grey or more green depending on the lighting.
I used two coats for the swatch below and, save my poor application at the base of the nail, the polish went down evenly. The formula was a bit thin, but still pigmented.