There are many wrenches being tossed around for sure. Many of them have very valid arguments. In this thread, I myself essentially throw my hands up near the end. It has shaped a lot of how I attack these things today.
viewtopic.php?f=3&t=15397&hilit=armor+colors&start=75Simply put, there is a lot of inconsistency even on screen used sets. Even where we see overall consistency, the color tones from lighting environments are never apples-to-apples.
Age and fading is a real thing (see Ski's surviving armor) so who knows what else is 'original' but not "as originally seen". A frost armor set had two types of brown on it, so was that original or did someone attempt to restore it/touch it up at some point in the decades that it was passed around? All impossible questions to answers.
All we can do is present starting points then go with your gut from there. Personally I lean on the production photo info as the most reliable 'starting point', but even then I very recently decided I despised the "matt sand" and actually stripped off all the weathering from my entire set of armor just so i could repaint and cover the tan with something else. Huge pain in the butt, but worth it to get rid of it.
So back to the point, we can never have too many visual aides! Please do post your chart with how you believe to be accurate. I look forward to seeing it.
(Side note/question: Where did you hear Terry was using the "red brown"? I have seen sets that are several years old that appear to have had that reddish tint to the brown, but my own Terry set from around 2 years ago looks pretty clear as the 98 Chocolate brown. I used the 98 Chocolate on my own hand made armor and aside from the additional weathering on mine, the browns appear identical, for whatever that is worth.)