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Re: [BKARTS] BOOK_ARTS-L Digest - Corn Starch paste, etc.



This is great info, Jack!
  Thanks to all for their great tips and tricks, wisdom and expertise here
on this list. I am learning lots and really appreciate having the
opportunity to do so!
  Perhaps someday I'll actually have something of interest to contribute
back to you.

Happy Holidays to all,

Meredith ( a humbled book list lurker)


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Date:    Thu, 11 Dec 2003 00:49:50 -0800
From:    "Jack C. Thompson" <tcl@xxxxxxxxxxxx>
Subject: Re: corn starch paste

I don't want to rain on anyone's parade, but corn starch makes
a brittle adhesive.

Flour pastes are adhesive enough, but bugs like to eat that paste.

Wheat starch is better; rice starch is whiter, and bugs don't have
any gluten to eat.

It all gets down to the size of starch granules and how many of them
burst during the cooking to create an adhesive.

And a 1:5 ratio is a good starting point.

Try an experiment.  Cook up a fresh batch of paste.

Make up a batch of paste, but don't cook it for a couple/three days.

Compare the adhesive properties of the two pastes, made from the same
starch (corn/wheat/rice, etc.)

After straining the paste add water and a 2% solution of methyl cellulose
while mixing to get the working properties you desire.

The resultant adhesive will be more flexible than starch paste alone.

If you are working with hide glue, add some wheat starch paste and that
adhesive will be more flexible than with hide glue alone.

Small details can make a large difference.

Cheers,

Jack


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

503/735-3942  (ph/fax)

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

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

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