Quote:
Originally Posted by butchie_t
JMHO. I doubt they even considered that there were UV brighteners in the ink. It just matched what they needed and they used it.
A complete WAG on my part.
Butch.
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That would be my thinking too. Multiple plants, some using ink with a brightener, some not.
To make it worse, there are some that react with a very dark red color. under specific UV wavelengths. They're much less common, although it is possible I just didn't get batches from the right source.
Why that is for sets that are older I'm not sure. It's much less pronounced, and affects green as well as orange.
I plan on going through all years after the holidays to get an idea of how far back this goes. I do know that many sets have dull or bright back colors under normal light.