Posted By:
Ted ZanidakisAll the way back to 19th Century Lithography printing,
a 4 - color process is employed to create all the various
colors. The inks used in this process are Yellow, Magenta,
Cyan (blue), and Black. So, each card (or sheets of cards)
go thru 4 inking passes in order to produce the completed
cards.
So, all these cards are simply printing errors and not true
"variations". However, they are really neat; especially the
two Donovan cards. I've had (and have seen several) Yellow
ones before; but, never a Blue one.
The Blue one is very unusual; since my understanding of this
color printing process, is that the Yellow ink is normally
the 1st inking pass in the printing process. And, in this case
the Yellow ink stage was obviously skipped. So, the Cyan ink
was applied, which would have normally resulted in the Green
background; but, since there was no Yellow.....Blue resulted.