[Table of Contents] [Search]


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [BKARTS] pancreatic enzyme?



There were two uses for removing gloss from Cibachrome prints 25 years ago, bleach and pancreatic enzyme.
Since the enzyme broke down gelatin it etched the surface and reduced gloss.


The problem was always control; consistent temperature, time and an even application, usually in a bath.

The trouble with health food pancreatin is that is most often in pill form which contains many additional indgredients
including binders.


Consistency is better served with pure and powdered.

bon chance

michael


----- Original Message ----- From: "Jack C. Thompson" <tcl@xxxxxxxxxxxx>
To: <BOOK_ARTS-L@xxxxxxxxxxxxxxxx>
Sent: Saturday, August 04, 2007 12:08 AM
Subject: Re: pancreatic enzyme?



Pancreatic enzyme is manufacture from the pancreas (generally) of
pigs.  It is intended to be used in a water bath at body temperature.

Basically, there are two enzymes in the stomach; one to digest starches
and another to digest proteins.

It will work to dissolve flour/starch pastes, and animal-based glues.

Sort of.

It was something which was being tried out more than 20 years ago by
paper/book conservators who were experimenting with enzyme treatments
to separate things bonded with flour/starch pastes or glue, or a
combination of the two/three.

There is some literature on the topic.  Some conservators went for
very specific enzymes; some took a shotgun approach (pancreatin)
and, while it works, it is also a bit fussy.

Natural enzymes work best at the temperatures they evolved in, i.e.,
body temperature. If this is maintained, they work fairly well.

It has no effect on cellulose, so paper is safe.

At one time pancreatin was available in the health food section
of grocery stores as a dietary supplement.  It still may be; I
haven't looked for it for some years.

Jack


"J. J. Foncannon" <bolu.bolu@xxxxxxxxxxx>
Subject: pancreatic enzyme?
What's this about pancreatic enzyme? Where can I get it?
--
I am an old man and have known many troubles, but most of them never happened.
---- Mark Twain

Thompson Conservation Lab. 7549 N. Fenwick Portland, Oregon 97217 USA

503/735-3942

http://www.teleport.com/~tcl

"The lyfe so short; the craft so long to lerne."
Chaucer  _Parlement of Foules_ 1386

            ***********************************************
              The Bonefolder, Vol. 3, No. 2, Spring 2007
         Now Online @ <http://www.philobiblon.com/bonefolder>

    Visit "The Book of Origins: A survey of American Fine Binding"
               Online exhibit and catalog order form at
      <http://library.syr.edu/digital/exhibits/b/bookoforigins/>

            For all your subscription questions, go to the
                     Book_Arts-L FAQ and Archive.
         See <http://www.philobiblon.com> for full information
            ***********************************************


--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.476 / Virus Database: 269.11.4/935 - Release Date: 8/3/2007 5:46 PM




***********************************************
The Bonefolder, Vol. 3, No. 2, Spring 2007
Now Online @ <http://www.philobiblon.com/bonefolder>
Visit "The Book of Origins: A survey of American Fine Binding"
Online exhibit and catalog order form at
<http://library.syr.edu/digital/exhibits/b/bookoforigins/>
For all your subscription questions, go to the
Book_Arts-L FAQ and Archive.
See <http://www.philobiblon.com> for full information
***********************************************



[Subject index] [Index for current month] [Table of Contents] [Search]