I'm not sure of the proper term for it, but I believe it's caused by over inking, or possible poor viscosity in the ink, then the extra ink is pulled outside of the desired image area. I could also be wrong about that so I'll let the real experts chime in.
Pollux..The right terminology is called "INK PULL".. They are likely the result of ink that is a little too thin, or fluid, and when the paper is pulled from the plate.
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