It would be very much a secondary source. It depends on the context whether
it would be acceptable. I have not published anything on the subject and
have only seen one piece of zinc, found in the UK. An acknowledged expert is
Dr. Paul Craddock of the British Museum but I cannot recall a suitable BM
publication, though I am sure there must be one. The Museum will probably be
able to tell you.
I do not have an e-mail address. They have a website at
www.british-museum.ac.uk. You could try [log in to unmask] but
this is a guess.
Peter
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