This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
For cartridge ribbons, such as the one in ImageWriter II, it is easy to
'restore' a ribbon to dark printing with a few spritzes of WD-40. Using a
pocket knife, pry off the lid of the cartridge, and, as evenly as possible,
lightly spritz the bunched-up ribbon. Restore the lid and roll the tape back
and forth a few inches. Let the cartridge sit for several days in a plastic
bag.
The idea is that the WD-40 spreads unused ink into the ribbon's print
area; so, it will not work for restoring multi-Color ribbons. Since you are
adding no ink, this trick is good for only one or two 'restorations'.
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