I know the experts disagree, but I think there are actually two browns here.
There is the brown of the scrap cards that is incredibly rare, and then there is darker brown like the one in post #10 that is not uncommon. I have an Old Mill like this, that is clearly a different color in hand, in picture, and under microscope. I think it unlikely this is due to time or fading. I have thousands and thousands of black backed T cards from the ATC project 1909-1912 - nothing except some Old Mill T206 Southern Leaguer's has toned to this brown at all. I think it unlikely a different kind of black ink that ages to brown sometimes was used only for Old Mill T206's and for nothing else from ALC/Brett/Etc.
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