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Re: [Marbling] Alum mordanting

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  • irisnevins
    thanks for this refresher course! Iris nevins ... From: Jake Benson To: Marbling@yahoogroups.com
    Message 1 of 2 , Aug 13, 2007
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      thanks for this refresher course!
      Iris nevins
      ----- Original Message -----
      From: Jake Benson<mailto:jemiljan@...>
      To: Marbling@yahoogroups.com<mailto:Marbling@yahoogroups.com>
      Sent: Monday, August 13, 2007 1:14 PM
      Subject: [Marbling] Alum mordanting


      Hello Everyone,

      Don Guyot wrote a two-part article in Ink & Gall:

      Guyot, Don. A "Alum and its Use in Paper Marbling. Part 1. Historical
      Material." Ink & Gall. Taos, NM: Fresh Ink Press, Vol. 1, No. 3,
      Winter, 1987, pp. 6â?"7, 18.

      ---. A "Alum and its Use in Paper Marbling. Part 2. The Solution." Ink
      & Gall. Taos, NM: Fresh Ink Press, Vol. 1, No. 4, Spring, 1988, pp.
      10â?"12. Table.

      In it, he suggested that the aluminum Sulfate bonds with Ox Gall and
      creates a new molecule, Aluminum Glycholate (Sp? I'm writing this
      from memory). This resulting compound is Ph neutral, and any sulfate
      residuals can be rinsed away.

      Here is an excellent article by Irene Brückle (Conservation Program,
      State College at Buffalo) on alum sizing.

      <http://palimpsest.stanford.edu/byorg/abbey/an/an17/an17-4/an17-407.html<http://palimpsest.stanford.edu/byorg/abbey/an/an17/an17-4/an17-407.html>

      Dr. Timothy Barret (Iowa Center for the Book) has openly questioned
      the tendency to dismiss alum. In a significant paper that he wrote on
      the role of gelatin in paper permanence, he found that a small amount
      of alum added to gelatin sizing helped preserve mechanical properties
      after accelerated aging tests.

      <http://aic.stanford.edu/jaic/articles/jaic34-03-002_2.html<http://aic.stanford.edu/jaic/articles/jaic34-03-002_2.html>>

      In the above article, Barrett cites in turn a study of traditional
      glue and alum mixtures in Japan, known as "dosa". This was often used
      to "waterproof" paper. While Barrett admits the levels were extremely
      high, the aging tests showed sustained mechanical performance.

      Alum has been added to sizings for centuries, but how much, and the
      method varies a great deal, and can probably affect the resulting
      quality. Mohamed Zakariya uses a lump of alum when making his Turkish
      aher solution (beaten egg white external sizing). He beats the egg
      with the lump, and then removes the lump when done. He is not adding
      a powder to the mix. The little bit of alum imparted is enough to
      render the paper waterproof for calligraphy.

      Jake Benson















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