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Re: pH, paper, paste, postal inks, etc.



Thanks, Jack.  I knew coal-tar dyes aren't very permanent, but I guess I
didn't know that they'd been used for inks.

Carol
Eugene
============

Jack C. Thompson wrote:

> Carol Pratt asked me about fading autograph album/postal inks.
>
> That's too large a question to answer definitively in an email,
> but in general, fading inks were manufactured from coal tar dyes
> in a solvent (water, alcohols, etc.) with a little glycerin and
> other chemicals to help them flow from the pen, or stay wet on
> a stamp pad long enough to be stamped on an envelope where they
> would dry, more or less, on the paper.
>
> Cheers,
>
> Jack
>
> Jack C. Thompson
> Thompson Conservation Lab.
> Portland, Oregon
>
> (503)735-3942 (voice/fax)
>
> http://www.teleport.com/~tcl
>
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            BOOK_ARTS-L: The listserv for all the book arts.
      For subscription information, the Archive, and other related
            resources and links go to the Book_Arts-L FAQ at:
                      <http://www.philobiblon.com>
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