The ink wouldn't necessarily have to be inferior.
Inks were and likely still are mixed by hand for many colors. (They definetly were into the 1980's, but there may be more premixed colors available now)
It could be as simple as a different operator reading the ink recepie differently.
There are a couple other ways the light ink could happen.
The presses have some control of the ink volume, a different pressman may have run a bit less ink.
If they were low on blue they may have added a small ammount of white or a different blue base to the mix, not enough to change the color in a major way, but enough to stretch the last bit of some remaining stock.
Steve B
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