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Re: A question



I'm glad it is just talcum. We once had a request for help for boxes of
books that had DDT dumped over them.

Annie Armour
Sewanee



At 08:57 AM 03/01/2000 -0500, you wrote:
>While surveying a collection of books for preservation evaluation purposes =
>I came across a volume that had powder sprinkled throughout.  Included was =
>a note on a slip of paper that indicated the powder was talcum.  What =
>might have been the reason for using the talcum?  What is the best method =
>for removing it?  I ask because after brushing the powder away very =
>carefully there seemed to be a residue left behind on the page.
>
>- Walter Cybulski
>National Library of Medicine
>
>>>> <info@papertrail.on.ca> 02/29/00 10:55PM >>>
>If you can extract a bit of the powder onto some clean paper (waxed paper
>might be better), put a drop of vinegar on the powder; bubbling (generation=
>
>of carbon dioxide) would indicate that it is most likely sodium bicarbonate=
>
>(baking soda) or calcium carbonate (chalk). If you can't get enough =
>powder,
>though, it might be difficult to observe the bubbling. Also, make sure =
>that
>your "clean" paper does not itself cause bubbling!
>You can tell these two powders apart because baking soda will dissolve
>completely in a moderate amount of plain water, but chalk does not =
>dissolve
>at all.
>
>Other substances fizz in vinegar too, but these two would be the most =
>likely
>candidates.
>If it does not fizz, it might be, as you suggest, mould or fungus, but it
>could also be talcum.
>-Kevin Martin
> the Papertrail
>
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             ***********************************************
            BOOK_ARTS-L: The listserv for all the book arts.
      For subscription information, the Archive, and other related
            resources and links go to the Book_Arts-L FAQ at:
                      <http://www.philobiblon.com>
             ***********************************************


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