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Re: [BKARTS] Johnson Edition Paper



I am interested in the effects of alum.  Since alum is used in marbling to
prepare the paper to receive and retain the colors (in most modern
marbling), does this have a long-term effect in breaking down the paper?
Any other deleterious effects?

Signa

-----Original Message-----
From: Book_Arts-L [mailto:BOOK_ARTS-L@xxxxxxxxxxxxxxxx]On Behalf Of
james tapley
Sent: Wednesday, September 14, 2005 11:14 AM
To: BOOK_ARTS-L@xxxxxxxxxxxxxxxx
Subject: Johnson Edition Paper


Just in case, Jet, you want more information: If the paper, and odds
are good, has an alum rosin sizing then the yellowing you see is
likely caused by the degradation of the size. This will contribute to
a weakening of the paper itself.
Also, an overabundance of alum in the paper can lead to the
degradation of the paper fiber especially in the presence of residual
chlorides from the bleaching process. Aside from being used to
promote the even settling of the rosin on the fibers alum was used as
everything from a mold inhibitor to an anti-frothing agent. The exact
mechanisms by which alum can cause fiber degradation are still not
fully understood.
As Karen noted your edition predates the large scale use of wood pulp
in papermaking. However the industrialization of the various
processes was well underway marked especially by the introduction of
strong chemicals to speed pulp preparation.
It is the residue of these chemicals which is largely to blame for
the deterioration of paper of the period.
It was and still is possible to make absolutely horrible paper from
the very finest initial rag content.
Best, James

             ***********************************************
Edelpappband / "Millimeter" Binding Bind-O-Rama, Entry Deadline - October 1,
2005

             For all your subscription questions, go to the
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             ***********************************************
Edelpappband / "Millimeter" Binding Bind-O-Rama, Entry Deadline - October 1, 2005
                                    
             For all your subscription questions, go to the
                      Book_Arts-L FAQ and Archive.
                                    
          See <http://www.philobiblon.com> for full information
             ***********************************************


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