Hi Doug,
Besides the issues that you raise, there is also a question of the photos that we use. Whether electronic, or in print, the accuracy can be affected by a number of factors, such as lighting and color sensitivity of the film or sensor. Unless corrections are made, each addtional step, such as printing or saving the image as a jpg can introduce additional errors. We are left with doing the best that we can with what we have available.
I do not in any way guarantee that the colors that I used are correct, but I think that they are reasonable. If you compare them to
the photo of original fabric "stored in ideal conditions" posted earlier by Hans, you will see that they are close. The biggest difference is the lavender, which is darker and more saturated.
Any changes I made from the color sampled from Hans' Photo were the result of mixing the original fabric colors with those of the Australian War Memorial. As you noted, there may be reasons why these are not correct, but if you look at their
"Albatros Fabric Research" page, you can see the new fabric compared to original fabric from the same plane from areas less exposed to sunlight. It appears to me that their colors are also reasonable. If there was a big difference, I stayed closer to the original fabric.
How the fabric looked in the field is a whole different question. How much did the fabric faded in two weeks or a month? How much did the dope and or varnish yellow in that time? I have no idea. I would guess that the lower fabric would be less susceptible to these effects, because of less exposure to direct sunlight, but I could be wrong.
In all of this, I do not claim any expertise. I am learning just like everyone else here.
Steve Mc