I should mention that mistakes were not blotted out in the Middle Ages. They used a cross-over line to highlight a word (like a modern highlighter but darker) and they used a row of dots to indicate a mistake (usually to be corrected if a future copy were made). Not always, but dots were used about 90% of the time. Little dots, underneath the mistake (not on top or over-riding it).
Blotted out words or letters were exceedingly rare. Ink spills are not so rare (and occur fairly frequently in the VMS), but blotting wasn't the usual way of doing things.
Blotted out words or letters were exceedingly rare. Ink spills are not so rare (and occur fairly frequently in the VMS), but blotting wasn't the usual way of doing things.