Printing Keys and using OCR.

[Robert J. Hansen]

> For paper to last 100 years is not even vaguely impressive.  Paper
> regularly lasts many hundreds of years even under less than optimal
> conditions.

As an example, the modern paper ballot is about 2,200 years old.  The  
reason why we know this is we keep finding them.  They practically  
litter archaeological digs around Rome.

That said, for paper to last so long it needs to be archival-quality  
paper.  High fiber content, low acid, very enduring inks.  But it's  
certainly possible to get 2,000+ years out of paper for under $1 per  
sheet.