Light impressions, University Supplies, and Hollinger sell archival photo pens 
that I use when writing on typically non-porus surfaces that need a thick line
(mylar, poly, etc).  I don't know how they'll hold up to the water test, but it 
may be worth a try.  

For really fine stuff, I had used Micron pens, but my new favorite is the 
Millennium Pen.  It's a felt-tip, acid free, waterproof, light fast, fade proof, 
non-bleeding made by Kuretake Co. Ltd (I have it sitting in front of me).  It 
comes in lots of widths, but I really like the 005 (I think that's .5 mm).

Typically though, all of our lables have no risk of contact with other artifacts 
because of bags, label covers, or other buffers.  

Also, the Museum Tech before me used primarily Sharpie or Micron pens.

-Elizabeth Cahill

Elizabeth Cahill
Museum Technician, Cultural Resources
Great Smoky Mountains National Park
107 Park Headquarters Road, Gatlinburg TN 37738
ph: 865.430.0340
fx: 865.436.1220

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