One of the Holy Grails of airbrushing is to be able to spray any color from an airbrush without changing cups or cleaning up between colors. Through the years there have been many attempts at this and a few are shown on the following pages. The biggest design problem to overcome is any residual color left in the paint path could mix with the colors used later on.

1909 - Edwin Frazier's early design had a big plus since it was a simple external mix and there was no real paint path. It used a round "carousel" design for the paint cups.

A Rainbow of Color