Anyone remember these? A couple of geniuses (genii?) from South Korea have done the same with spray paint. It’s got two control wheels, one for hue and one for balance to control its output, although I couldn’t find anything about different nozzles. Should it prove any good, it’ll massively reduce the hassle of carrying 72 different colours about, and allow beginners (and those writers who refuse to shoplift and paint in halford’s touch up range) instant access to every colour bar the metalics and, er, white.