I was examining a new raw card purchase closely earlier, when I noticed something that now seems obvious: there’s quite a bit of shade variation in the blue border on the back of Pokemon cards.
At first I thought my new Raikou Ex had a border a bit too dark a blue for the era - but I found 5 other raw cards and a few PSA cards with the same deep blue. Compare the Sunflora and Raikou with the Feraligatr below. Looking through my PSA cards, same thing. Perhaps 3 or 4 subtly different shades between the two extremes in the picture.
Anyone know if this caused by anything in particular, say light exposure, or just how they were printed originally?