^ Fantastic example of how black fades on the T cards. Even the right chemical combination doesn't create the same brown that brown back cards have; it's more of a grayish browning.
If fading created brown, we'd see brown T218 Mecca's and dozens of other sets using black backs from the same production facilities at the same time. We don't; only a very small subset of T cards is possible to find with brown backs, precisely because they are a truly different back.
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