I would agree if all colors were faded due to sunlight. But due to a dab of glue? I am sure many cards that were glued retained the red color or else there would be an epidemic of redless cards. Im pretty sure all cards were printed using red plates. Let's remember that quality control was horrible and if it looked ok cards would be circulated. And the most important thing here I believe is the type of printing. Six to seven separate colors were used thus creating thickness on the image itself so even if red faded you would still see where the red was applied. Harder to tell on faces because because they required more minute matrix dots and the faces would use all colors. The background color of the Sullivan used what is today known as op art. Yellow with red dots to give an illusion of an orange background. If you look at the pick of the one with orange red background you can see a texture . that texture would have remained.
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