This ink set was designed to be achromatic to the human visual system when printed on a very specific color of white paper. The paper we designed it on is Hahnemuhle Photo Rag. When viewed under a full spectrum 5000k light source (this is the color of white that a standard human sees as neutral), a photograph on these two papers will appear to be neutral. This ink is a legacy product that we are formulating in very small batches.