Ink Wash is a near-black at #2A2A2A, effectively neutral. Dark colours show every ridge in the nail plate, so a ridge-filling base coat does more for the finish than the colour ever will.
A jelly finish: translucent with depth, like stained glass. It layers over itself, going deeper with each coat rather than more opaque.
It paints 1 design in the catalogue, most often alongside Milk Bath.