The airbrush, that tool behind tattoos and T-shirts, may have an unexpected future… in technology. A group of engineering students have come up with a method for using an airbrush to make microelectrodes — tiny conductors used in an increasing range of consumer, research and medical products. The technique is simpler than the standard one, at least for small projects that require production of only a few electrodes.
https://www.sciencedaily.com/releases/2008/02/080214114441.htm