I don't have a blacklight unfortunately.
I must say I am honestly stumped. I have included a set of scans on my site. One is from my scannner. And i highlighted the interesting parts that i notice red ink on, that you really can't see with the naked eye....particularly the grass in the background.
the loupe pictures were much harder to take because of steadying the hand and the area i can realistically take a photo of
in focus.
while the hat looks colored in and fake when you look at it, the more up close you look the better it gets, its tough to tell in the middle of the hat because there are scratches on the surface of the card and they add to the shadow/textures in that area.
there are places where there is blue ink and red ink on the uniform that look really consistent with a shading pattern and the hat where the jig jags are have a very very fine spatter pattern that is consistent with how the ink would have been laid down.
Delehanty Red Hat
kevin