The binary ink developer (BID) in the Hewlett-Packard Indigo press converts low viscosity ElectroInk® into a pastelike layer that is presented to the photoreceptor. In the BID, ink solids move by electrophoresis onto the developer roller, and the layer is subsequently compacted mechanically and electrically by a squeegee roller. Quantification of ink solids content in this layer facilitates ink formulation and provides insight into BID operation. In this work, we describe the use of a unique tool developed in-house for profiling ink density on the developer roller. This device controllably removes submicrometer strata of ink from the rotating developer roller by applying a step-wise variable force to a scraping blade in contact with the roller. We find that the solids distribution within the paste layer varies depending on the electrophoretic and the squeegee roller voltages. A typical concentration profile starts at a minimum furthest from the roller, peaks within the paste layer, and then drops again as the developer roller surface is approached. We discuss the origin of this profile.