Ben- very interesting and thanks for showing that. It's also interesting that in was in UV protective plastic and still did that.
Steve- Thanks for the explanation. I was reading about paper & trying to research to find out what type of material they were using back then. I found this site:
http://www.pulpandpaper.org/history.shtml Pretty interesting stuff.
O/T a little-my wife bought a floral print very colorful outdoor rug for our patio. I has black, red, yellow, orange, blue, gray. I think it's been out there about 8 months now. ALL of the colors have faded-evenly. Every color faded out the same.No color completely faded away (yet, at least). I know it has nothing to do with cards-but I understand the sun can fade colors. Steve gave a great explanation as to why the red is affected the most, but I'm still having trouble with the idea that you would not even be able to tell the red was once there.
Even on Erick's card (hey Erick

) you can tell there was some type of glue or paste or something on the back of the card, at one time. It leaves you to wonder, is it missing color from the press, or was it from chemical/glue/paste, etc.? This may have been why it didn't go for as much as you'd hoped for-I'm just guessing on that one. Awesome card though!
Now, I'm going to post this Sharpe card because I think somewhere along the line this card was either glued into a scrapbook, or came into contact with some type of chemical/glue/solvent/something? The back of the card has blue ink smeared all over it (blue same in from the "Piedmont" add) and the red on the front looks a bit light to me (sorry for the crappy scans). The reason I am showing this is because with whatever happened to this card, you can still see the red is red.
And lastly, I'm not saying anyone is wrong here- just trying to cover all areas, and trying to figure out a sure fire way to detect a true missing red pass card from what some of you say is a card that has been affected by the sun. Rob and Ron posted about the Abstein card, and I think that card is legitimately missing the red pass in quite a few of them. The same way I think the Willis portrait was deliberately printed with two different colors-red and burgundy (or would you call it violet?). Maybe many more missed the red pass, and it would be pretty cool to try to place some of these cards on the same sheet if possible. That's for another thread I'm sure
Sincerely, Clayton