I had never heard of Grading Rainbows or considered such a thing before seeing the article. In fact, I don't pay any attention to post-1975 cards, which is apparently where the phenomenon has taken root. But it struck a chord with me because I had gotten in the habit of bidding on cards that I thought had great eye appeal for players I collect from sets that typically struggle to be well centered without help from a card doctor.
So, it turns out that I have a few partial "rainbows". For example, here's a 1952 Topps Minnie Minoso mini-rainbow:
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