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Subject: pH testing

pH testing

From: Greg Schmitz <gws1>
Date: Saturday, June 18, 1994
I am researching methods for testing the pH of paper stock and am
seeking more information about the techniques available for doing this.
My interest stems from the effects of paper pH on the final outcome of
many photographic printing processes (both silver and non-silver).  I
have found reference to 4 methods in Peter Sparks, "Technical
Considerations In Choosing Mass Deacidification Processes," part of the
COOL database.  The methods mentioned by Sparks are: flat-head
electrode, hot or cold extraction, and color indicator.  I have yet to
find any instructions for conducting these, or any other, pH tests on
paper.  I am familiar with pH "pens" however the results, that I have
seen, are too gross for my purposes; though they do provide a simple way
to assess whether a paper may be appropriate to a given process.  Any
information, pointers to information (URL's, bibliographies, etc.) would
be welcomed and appreciated. Thanks,

    **** Moderator's comments:

    1. Search CoOL some more, as this has been discussed at least a
    little in the DistList. There are also a number of refs in the bib
    areas of CoOL.

    2. There are TAPPI guidelines for hot and cold extraction. Tappi is
    the Technical Association of the Pulp and Paper Industry.

    3. The standard ref on this sort of thing is: Browning, Bertie Lee.
    Analysis Of Paper. 2d ed., rev. and expanded. (New York : M. Dekker,
    1977). There may be a newer edition, but I don't know.

Greg Schmitz
Dept. of Art History and Archaeology
Columbia University
Room 826 SCHR
New York, NY  10027

                   Conservation DistList Instance 8:3
                  Distributed: Tuesday, June 21, 1994
                        Message Id: cdl-8-3-012
Received on Saturday, 18 June, 1994

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