Digital BW, The Print

This is obviously not about BW printing, but is related nonetheless.

I'm trying to get all my supplies together for proper acrhival framing. 
  I got the archival mats and mounting stuff together.  But what about 
sealing the frame?  I have seen a kind of kraft paper taped onto the 
back of many frames.  What kind of paper is that?

thanks,
allan chen
-- 
Technical Projects Specialist
Academic Computing
Stanford University
v - (650) 996-0546
f - (650) 725-4685