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The dyes used in cloth typewriter ribbons are held in place by fats & waxes (e.g., neatsfoot oil,mineral oil, oleic acid, montan wax, paraffin wax, etc.) so it is not surprising to find that they have bled over time.
Modern plastic typewriter ribbons don't have that problem, but I have no idea how long accession/catalog numbers would remain on cloth tape.
Writing numbers out by hand may not be as neat as typewritten numbers (I'm one of the few people who can read my writing) but they should last longer if good inks are used.
Jack
Thompson Conservation Laboratory 7549 N. Fenwick Portland, Oregon 97217
503/735-3942 (voice/fax)
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