Nope, totally debunked many years ago when a vintage sealed case was opened which contained figures with clear bubbles and others with yellow bubbles. Yes UV light is bad and can be either/both a catalyst and an accelerant but primarily it's the composition of particular plastics that's the predominant cause.
I've seen this too - could be a reaction between the plastics, with no air circulation.I suspect air circulation has something to do with it too. Maybe it's my imagination, but I think bubbles can yellow faster once they are sealed in afa cases (especially if they are then stored in polybags and on top of each other in boxes so the air really can't move.)
This already impressive find would have been even more amazing, stunning, with any Vaders in it :weeabooface: - considering the popularity of such figure and focus collectors out there always in the lookout for a Meccano card in their collection.No Vaders.......
Post in this thread : http://forum.rebelscum.com/forumdisplay.php?f=713
If your Leia has a 41 back card and French language on it, it is likely to be a Kenner Canada version. There is no French Meccano 41 back figure.