Matt gave a quick demo on making corrections by hand while at the Huntington Museum. He’s using a pot of “graphic white”—not our favorite brand, which is Deleter (#2), but it works—and a small sable brush, probably a no. 2. He’s demonstrating on a sample page that he used to demo layout, lettering, and inking the previous day.
He runs over several standard steps of correcting a page, including cleaning up smudges, tidying up panel borders, cleaning up lettering, as well as fine-tuning, like fixing chunky lines, “little nubs,” and spots where you’ve just changed your mind. He also touches on subtractive drawing and pasting down corrections on new paper.
update: more about Deleter!