Uni-Craft says orange with a white cockpit, and other models show colors from grey to grey-green. From Google it seems there are no color pictures at least. Thoughts? Any Argentine Modelers out there devoting time to this arcane pursuit?
Obliquely interesting question, Jim. I can't offer an answer, but I can offer a possibility. Firstly, a bit of background. The IAe.38 was based on the design of the Horten H VIII, on which construction was begun before the end of the war. British troops captured Gottingen and discovered components including wing sections and undercarriage units, which they duly photographed. When Horten was interrogated in Britain he offered himself to the British aircraft industry, along with plans to build this aircraft, but he elicited no response from any of Britain's aircraft companies, that I'm aware of. Drawings in English exist of the aircraft and its unique layout that were made based on the existing components and plans that survived at Gottingen.
There is a colour profile of what the Horten H VIII might have looked like in Dan Sharp's magazine Secret Wings of the Third Reich. Its wings are depicted as being natural wood with the fuselage in silver dope.
When Horten went to Argentina he built the IAe.38, but it was four engined, although the Horten H VIII was six engined. The nickname "Naranjero" came from the fact that no practical use could be found for it and so it was used to ferry loads of oranges around the country, a naranjero is literally "orange boy/guy/fella", in this context meaning a carrier of oranges. There's not much out there on this aircraft in English, I happened to stumble on some stuff in Argentina in Spanish, but alas, there were no colour pics.
In a book I bought on the Pulqui fighters built by FMA there is a picture of the Pulqui I in a hangar and at the back is the completed IAe.38. It is in a uniform colour, but it's impossible to tell exactly which one. On the Wiki page there is a good side view in the same hangar, which looks like it could have been natural wood and fabric covering based on the texturing at the time that photo was taken.
I found this of interest, the B&W pics have been colourised.
I.Ae. 38 Naranjero Tipo Avión de transporte táctico Fabricante F.M.A. Diseñado por Reimar Horten Primer vuelo 9 de diciembre de 196...