Having frequented quite a few card shops in the 1990's/early 2000's you would be amazed at the color transformation of many of the cards that they had in counter displays and cases, they had changed colors quite a bit due to both Sun uv rays and fluorescent lighting. Now most of these were 1950's and 60's cards as that was what was mostly sought after but I am sure that in some areas quite a few early cards were put out as well. I also have a friend who has many of his cards out in the open on display in his home for quite some time and several have lightened up. Further the amount of glued (not paste) in early cards that were removed via solvents has created many of the psychedelic multi color cards as mentioned by others. Food for thought.
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