I used the Dr. Colorship a few years ago, working on some quite small chips (smaller than match head-sized for the most part). It's really easy and does a reasonably good job. (If you look at all close, you can still see them...but they are definitely better than before, especially since the primer---which is what was showing previously---is stark white.) If you do a Search on "Dr Colorchip" and "Langka" (which I haven't tried), you'll get all kinds of hits.
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