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One has to realize that each batch of ink was hand mixed and they didn't have the equipment to mix every batch identically they even used different pigments at times
ice
Very true Mike..When I took graphical arts (Printing) in high school, we did not have huge runs, but when we did, and some times had to open a new ink supply, the colour was off slightly..We didn,t care and I suppose the post office probably felt the same way..They were not into supplying a constant product to stamp collectors, but it is a business..MONEY was at the fore front of all their decisions.
Robert