I've recently gotten back into things after an absence of a few decades and have discovered the proliferation of varieties in the Centennial definitives (yes, I'm
very late to the party!). While going through the doubles I had stored away, I discovered a number of 6c orange that appeared different under UV. The stamp on the right is typical of the majority that I looked at, appearing dark brown or black under UV. But a fair number resembled the stamp on the left, showing up as reddish under UV. Is this the fluorescent ink variety that I've read about, or is it just normal variation? I'm asking primarily because of the number of stamps I came across that showed up as that reddish colour; it was about 20% of the 459s I looked at. I didn't expect anywhere near that number, given an old thread I just read where the poster indicated only finding 2 in a batch of thousands - and here I found 5 in only a couple dozen.
Posted 03/04/2018 7:17 pm
