At the end of the 2 October 2008 entry, where I first discussed the WIPA 2008 United Nations personalized sheet, I mentioned a report that there are two types of gum on this sheet. Thanks again to Helmut Jörg, we now have confirmation of the cream gum (S26) and the blue-green gum (S26.1). These gums are shown below, and are the back sides of the two WIPA sheets shown above. At least in this case, there are no extreme color differences on the front side. One sheet might appear to be slightly bluer and the other, but this is just the light passing through the blue-green gum.
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