The grading services do not differentiate betweem the colors when they do their grading or their pop reports so it is difficult to tell which of the 6 (actually 7 but that's another story for another day) colors is the toughest. I've accumulated a lot of E94s, buying them card by card, so I have an idea as to color scarcity. The general consensus appears to be that gold and violet are the toughest but that olive green (the lighter green) is the hardest to find in nice shape for some bizarre reason. The caveat is that certain players are almost impossible to find in certain colors for some reason. An example is the Bates card, which although tough just like all E94s, has been impossible for me to find with a red background. Violet and gold were found quickly but red has been a real pain.
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