Wiktionary
n. An instrument used to remove ink from a write surface, either (traditionally) a metal scraper or (more recently) a special pen dispense a chemical that eradicates ink.
WordNet
n. an eraser that removes ink marks
Wikipedia
An ink eraser is an instrument used to remove ink from a writing surface, more difficult than removing pencil markings. Older types are a metal scraper, which literally scrapes the ink off the surface, and an eraser similar to a rubber pencil eraser, but with additional abrasives, such as sand, incorporated. Fibreglass erasers also work by abrasion. These erasers physically remove the ink from the paper. There is some unavoidable damage with most types of paper and ink, where the paper absorbs some ink.
The chemical ink eradicator contains a substance that reacts with some inks removing their pigmentation and hiding the writing.
Usage examples of "ink eraser".
Near the bottles lay a rod of glass with a curious tip, an ink eraser made of finely spun glass threads which scraped away the surface of the paper more delicately than any other tool that had been devised.
It would have made a creditable ink eraser, but was tough, gritty, and utterly without taste.
In places an ink eraser had been carefully used, and while there were no misspellings, the letters were large and childishly made, drawn rather than written.