We found that using negative "crazy eights" worked out best for us. 
After 
you plot (or contact) your artwork, use artwork pens to color in 
the numbers to create your date code, lot no., etc...  If you use a
soluable ink, you can wipe off the ink after exposure using film cleaner
and change the code for later uses.  We used this schema to track "lots"
of boards as date codes were too vague to give precise enough tracking.

Tom Counts
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>----------
>From: 	[log in to unmask][SMTP:[log in to unmask]]
>Sent: 	Wednesday, November 20, 1996 7:40 AM
>To: 	[log in to unmask]
>Cc: 	[log in to unmask]; [log in to unmask]
>Subject: 	Re: Fab
>
>
>   Otto....
>           I am assuming that you are manually changing your artwork
>   masters to reflect some change so be very careful and remember to 
>   update your original CAD data. When we played that game of Russian
>   roulette, we would manually change the date code using a SANFORD 
>   (company name) permanent marker called "Sharpie". It worked well
>   enough. You could also use the press type letter, but they tended
>   to have problems adhering to the flim unless your spray coated or
>   covered them with a clear adhesive tape. Not great, but it worked.
>   Hope this helps.
>                                Regards,
>                                             Bob Vanech
>
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