Well, thanks Spector, but I believe Rob is da man here, for I have not personally examined any of these babies, other than some odds and ends at the IWM in London. Now, before you all make me eat my words, remember what Rob said about different colors for different years and factories. Here is a 128mm Jagdtiger shell;
Hey! That thing isn't yellow-green, it's black! OK, sorry, but it's the only color photo of this one I have. Black and white photos that I have of 128mm flak ammo are both brass and black steel. So where did I get the pale yellow-green ones? From Tank Power #16, pages 88-91. The other problem with this image is that there isn't any stenciling on either the casing or the projectile, which leads me to suspect that they have been repainted. But like I said, I have B/W photos of 128mm flak ammo that are plainly black. I'm going to bail out on this because I don't have any more info at the moment. If anyone wants the image of the yellow-green Tiger ammo, just drop a line and I'll post it.