Greg, we've made many different colors of cast pickups. Of course with the "brown" pickups there are MANY shades, and they do age. The polyurethane ages and so any color will not be stable, just like the originals. The most difficult color is the classic BSB color that the polyurethane originally came in. At the time, many people did not like the color of the pickups, as so black became the dominant color. We can still tint the pickup casting material, but it's not totally predictable.