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Re: [BKARTS] deacidification of color newsprint



Just washing an item in plain (preferably filtered particle and charcoal) water will wash out most of the acids in paper, especially with frequent changes. What the magnesium (or calcium) provide is an alkaline reserve/buffer which will help neutralize further acids that are introduced over time. Eventually though, in a poor environment, that buffering can be used up too...

But, back to the process described... In addition to the magnesium bicarbonate (MgHCO3) and water (H2O), the other essential ingredient is carbon dioxide (CO2) , best gotten from plain selzer water (NEVER any of the flavored stuff). NEVER use 7-UP/Sprite. It's pure sugar water and will cause other problems.

The way the process works is that the CO2 in water allows the MgHCO3 to go into solution allowing it to actually penetrate the paper (degree of penetration depends to some extent on paper type). Just dumping the MgHCO3 into the water only suspends it in the water and will leave a grit on the surface. Using Milk of Magnesia (tm) can work, but be aware that there are also other ingredients in it that may be less desireable.

Note that adding the alkaline reserve/buffering can actually cause some papers (such as newsprint) to darken slightly. The same can happen with non-aqueous solutions such as Wei T'o and Bookkeeper.

Hope this helps.

_____________________________________

Peter D. Verheyen
Bookbinder & Conservator, PA - AIC
<verheyen@xxxxxxxxxxxxxxx>
The Book Arts Web & Book_Arts-L Listserv
<http://www.philobiblon.com>

----- Original Message ----- From: "Silver MayKitten" <maykitten1@xxxxxxxxx>
To: <BOOK_ARTS-L@xxxxxxxxxxxxxxxx>
Sent: Monday, March 26, 2007 2:47 PM
Subject: Re: [BKARTS] deacidification of color newsprint



One quart warm tap water, 1/2 cup 7-up, or Sprite, 1 tbsp milk
of magnesia.

Mix the water and milk of magnesia, add to 7-up in a flat
nonmetallic pan, do not stir, the bubbles are part of the
magic.

Carefully sink the clippings in the solution making sure not to
overlap. Let set 10-40 minutes depending on age and condition.
Pick out clippings and apply to glass like ferrotyping photo
prints; place the desired image against the glass, being
careful to roll all the air bubbles out with a brayer. Let the
glass plate sit until the clippings are entirely dry, and fall
from the glass on their own.

I like to laminate in archival film as soon as possible after
the clippings are dried.

I say nonmetallic pan because I had bad luck with an aluminum
tray.

MaiKätzchen
--- Teri L Herbert <herbertl@xxxxxxxx> wrote:

What is the best way to deacidify a 2004 newspaper with
a color photo in the article?  Is a magnesium-based
deacidifying solution safer than a calcium-based one?
Have there been any studies on long-term color
retention in deacidified newsprint?  Have newspaper
inks changed since 2000?  Do different newspaper
companies use different inks?

Lots of questions and I would love to start a discussion on
this
challenge.

Teri Lynn Herbert
Charleston, SC
herbertL-at-musc.edu

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