Missing colors can be difficult to figure out.
Most of the real ones are missing more than one color.
I bought a couple cards from a group that had been framed and hung in a barbershop for about 40 years. Lots of them looked like missing red. The two I got are very hard to tell whether it's fading or the red missing. One has even gloss, another has less where the red was.
SGC did grade a few of them as missing colors, and also stopped soon after the source and fading was discussed here. (Maybe coincidence?)
I've done a bit of checking into if some science equipment could tell, but haven't found much that's definite. The machines are also rather expensive.
Steve B
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