The answer -And it's not a great answer- is maybe.
It would depend on whether the chemical affected the color on the back. So if there was something that would just remove yellow, it wouldn't bother any of the T206 backs. Something that took out blue would affect only a couple backs.
Another thread has an example of a chemically damaged PB where the blue has been removed from part of the back leaving just the black from the dark blue.
I do think your card is missing yellow and isn't damaged by light or chemicals.
Steve B
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