Here's what I see through a microscope (dark-stored Vs light-stored, about 150x). This is from a couple of steps of a 21-step gray scale. It seems to me that most of the cyan has disappeared from the light side.

The images below are also courtesy of Roger. They show part of a gray scale printed with black ink only. As hard as it is to believe, Epson has apparently replaced its former long lived black ink with one that turns brown.



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