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Re: [BKARTS] Enzymes



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Also, if I remember correctly, enzymes work best in a slightly alkaline, and fairly warm bath.  One must also be attentive, as was mentioned, to the washing out of paper size, as the paper will become more friable as it swells and loses sizing- and even with re-sizing, it's never going to be the same as it was.  Also, be aware that you will probably be changing the finished, dried "look" and "handle" of the paper after treating with enzymes.  So one must carefully decide which are the more important qualities to retain.

Bruce
----- Original Message -----
From: Peter Krantz <restore@xxxxxxxxxxxxxxxxxxx>
Date:         Fri, 12 Mar 2004 16:55:09 +1100
To: BOOK_ARTS-L@xxxxxxxxxxxxxxxx
Subject:      Re: [BKARTS] Enzymes

>              ***********************************************
>  MDE - Innovation 2004: An International Bookbinding Design Competition
>                     [No Binding Experience Required]
>                   Sponsored by Meister der Einbandkunst
>                      60,000 ? (Euro) in total prizes
>               Full information at <http://www.mde2004.org/>
>              ***********************************************
>
> Greetings,
>
> The problem of stubborn animal glue arose for us some years ago, and we decided
> to attend to the matter with an appropriate enzyme.  After must research and
> advise here and there, we obtained a bottle of Pancreatin, in powder form.
> According to Martindale's The Extra Pharmacopoeia, (a massive volume, and
> probably the best reference for chemicals, and proprietary and non-Proprietary
> drugs), "Pancreatin is an extract from Mammalian pancreas, containing enzymes
> with protease, amylase and lipase activity".  The bottle we have states "Source:
> Porcine".
>
> We soak the sheet in an  5 - 10% aqueous solution (W/V).  Over the years, we
> have used it a number of times, with varying degrees of success.  Sometimes it
> doesn't work at all.  At other times, it has been completely successful in
> breaking down the animal glue, allowing it to be wiped away with complete
> impunity to the paper being soaked.
>
> There are different types of animal glues, and some enzymes may not work on all
> of them.  We only keep one available in our workshop.
>
> Pancreatin is also an irritant to mucous membranes, so care is required in its
> use.  It is well written up in any decent Pharmacy literature.
>
>
> Peter Krantz
>
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     *Postings may not be re-printed in any form without the express
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