>>6097076 Hard to say but I think the factory yellow ranged from a greenish to brownish hue. The desert seems to have more of a reddish or orange-y hue to me. I remember reading that at some points, they used an oxide red base as well but that may have been early war.
Anyway, I was looking for color chips to post with this but came across this discussion which some of you might find pretty informative. I haven't gone through the whole thing yet..
http://www.militarymodelling.com/forums/postings.asp?th=69323 Pic is Life Color's swatch for FS30400 Afrika Korps Gelb, which seems a little less red than other examples I've surfed up. Something else to note is that consistency of color is going to vary some based on some factors like availability of material and batch mixes.