I just picked up some 12-field cels, and they're 
punched.  The RISD store doesn't carry un-punched 
ones, I suppose because students can't afford to 
punch their own when they're doing animation--
it's cheaper to just buy them that way instead of 
getting a $300+ punch.

Since I'm a fancel artist (duh) and these cels 
will be added to the 6 or 7 varieties of acetate 
I already use for cels, I'm thinking this could 
cause some problems.  I don't do the signature 
stamp on all my cels, because sometimes it's too 
big (but I still hide my signature or initials 
somewhere on it).  I have started signing them 
all on the paint on the back, but that can be 
painted over.

So I'm thinking of writing 'FAN' or 'F.C.' 
or 'GBB'(my initials)in the upper-right corner 
where the numbers of a cel would normally be just 
in case.  To make it extra obvious it's not a 
sequence cel, because let's face it, people are 
stupid.   

Does this seem like a good idea?  I'm leaning 
towards the 'FAN' option, because it seems the 
most obvious, but then, 'F.C.' and 'GBB' are a 
little more subtle, and they'll be in accordance 
with the signature or seal on the front and the 
sig on the back.