Many librares in Scandinavia use RFID, it is a practical technology. 
However, I am not sure what is the life expectancy of these chips - public 
libraries use them for stock which will be discarded when worn out. The cost 
is also fairly high, compared to bar code stickers. However, the idea is 
attractive - you could even use them to inventory stock without taking the 
materials out of the shelves.

If you decide to use normal optically-readable bar-codes, make sure that 
they last long enough. Some types just fade out and become unreadable. Not a 
problem on cereal boxes. We used bar codes to mark a hundred thousand CDs at 
Finnish broadcasting Company and had to replace 20,000 code stickers after 
five years.

I cannot answer your question about magnetic effects, but it is very 
relevant !

Pekka Gronow

----- Original Message ----- 
From: "Marie O'Connell" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, December 14, 2009 5:37 AM

> Hi all
> We need to renumber some of our older accessions and have been considering
> barcodes with the accession number included.  It was suggested to me today
> that we could be using RFID (radio frequency ID).  As I know virtually
> nothing about them I have an uneasy feeling about applying this technology
> to magnetic tape boxes and reels.
> Does any audio visual archive use this technology on its tape boxes and/or
> reels?
> Is there any danger to the magnetic tape itself, considering both the box
> and reel would need the same identifier?
> Can the actual accession number be put on these so as to be seen visibly?
> Any thoughts would be much appreciated.  Thanks in advance.
> Cheers
> Marie