May I suggest a visit to:
http://www.sha.org/publications/conserv_process.htm#N

They discuss labeling from a conservation perspective and even name a
brand of a white ink - sorry Joe but the word rapidograph does occur.

Silas Hurry
Historic St. Mary's City




> List folks:
>
> A simple question in regard to labeling artifacts (for example, green
> bottle
> glass) with white ink on clear base....  Is there a particular brand of
> white ink that works better than others?  And by using white ink is one
> back
> in the age of pen holders and nibs?  In other words are there any Micron
> or
> Micron-like pens available with white ink?  Thanks for any help you can
> offer.  Please, in your charity no reply with the word rapidograph in
> it....
>
> Joe Dent
> American University
>