I am still trying to dig it up...
The Alfa Club Magazine I mentioned is currently in transit from Australia, so I won't be able to find it there for a long period of time. The Rosso Miro is absolutely worth looking into. It is a very rare Alfa colour and has a very deep shine. A bit like a red version of the Alfa Pearl White (Bianco Nuvola "common" on 147 GTAs), which btw is stunning!!!
Looking at the site i linked to earlier, it is even apparent that the Rosso Miro is a dual tone colour, as to different tones are needed for completion. Should do well with the sensual contours of the Duetto, IMO.