I'd posted a brief thought about it on the original thread.
I think it's a combination of things.
If the cards were stored in a regular cardboard box that degraded the acid from that would affect the cards that were touching it.
I also think there are some interesting things about late 60's Topps cards as far as the cardboard goes. Some have the natural cardboard while others have a layer of white printed before the back. I'm also fairly sure some like 67 are a layered stock with the fronts glued onto a basic cardboard.
And that some of the cardboard used was better quality once in a while.
All those things could lead to effects like the ones shown. Especially the breakdown of the cardboard box.
Even the white ones currently sold. Some of my older ones are getting quite browned from age.
Plastic sleeves will help prevent it.
I love the all green backs! There's a few thigs that could do that.
1) Plate without the blank areas.
2) Running the press dry. The printing relies on a damp plate that the oily onk won't stick to, and if the water is allowed to run out the plate picks up solid color.
3) Similar to 2, but a loose bit of paper that gets stuck to the plate will pick up and transfer solid color too. But it's usually not a good solid print.
So my vote would be #2.
Steve B
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