You situation is rare, rare, rare, in my experience.
I have seen this, but only with chrome-plated copper-based rollers, which most people aren't old enough to remember. Because of the dissimilar metals and water-based ink solution, an electrolytic effect takes place, like reverse chrome-plating.
I have not seen this with ceramic rollers, no matter how old. If this is happening, I suspect a manufacturing defect. specifically, one where the ink is reaching the base, under the ceramic. That's a no-no, and to dkelly's point, a proper coating would avoid this, as, I might add, an impervious ceramic surface; impervious because it is well made.