Scott 2194 ($1 Johns Hopkins) Varieties

I'm not sure if it's possible to identify varieties based on scans, but I have these four examples of the $1 Johns Hopkins Stamp:



According to the Scott Specialized Catalog, these stamps are known in Blue, Dark Blue, Deep Blue and Intense Deep Blue.

I'm pretty sure that the last stamp (which has clear block tagging) is #2194 (Intense Deep Blue).

Through process of elimination, the first stamp is lighter in color than the others, so I am assuming it is the Blue (prephosphored uncoated paper) #2194e.

I'm not sure what the intensity difference is between "Deep Blue" and "Dark Blue". Could one or both of the middle two stamps fit into that category?

Any help will be appreciated.

Thanks.

Wow!! I didn't know Scott differentiated among the Hopkins stamps. I would say if you switched the middle two, you would have them in the order you stated. I'm going to have to check mine. I probably got twenty or so.

PP

Thanks for the help. I figure you're probably right. Now to find a copy of 2194f (Blue on prephosphored COATED paper!

Good afternoon all,


just got a #2194var pane of 20, plate flaw pos. 6. It also has an ink skip on the center of the lips(just under nose) pos. 11. I have checked with x100 scope and can say it is definitely an ink skip and NOT a scuff of the paper. Has anyone seen similar #1294 with the same anomaly? I have attached a link to the pic of pane. Thanks

I read about the posting of links. But I am interested to get feedback about the 2194 ink skip on the lip. I have put the link here with the understanding that administrator may opt to pull it.

https://www.dropbox.com/s/vdtotmfl4...ane.jpg?dl=0

I don't have much luck trying to discern colors on some of the Great Americans, Johns Hopkins included. I have better luck first looking at the gum & tagging ... of course, the gum won't help on used stamps. On my 2194b (deep blue) & 2194c (dark blue), the dark blue appears "bluer" & the deep blue appears "blacker". The id though comes from the difference in tagging (overall for b, solid for c).
My 2194d (blue) appears, in color, to be virtually identical to 2194c. But the tagging & gum come to the rescue since c has dull gum & d has shiny gum. My 2194f does appear to be lighter in color than all of the others. The gum on e is somewhat shinier than the low gloss gum on f, but again, that won't help with a used stamp.
One thing I have noticed is that the taggant on my 2194e (mottled) is blue green while on all other varieties it is yellow green. But I don't know whether this would be consistent across the entire issue. Will include a scan of my stamps below for comparison, in order by catalog number (2194, 94b, 94d, 94e, 94f).
One additional note ... the tagging on 94b, 94e & 94f seem somewhat similar. But on 94b, the design is obviously covered by taggant. And, as I mentioned, on 94e the taggant appears blue green.