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Re: Flattening a vellum leaf
- Subject: Re: Flattening a vellum leaf
- From: Joost Backus <joostb@plex.nl>
- Date: Mon, 21 Feb 2000 20:50:09 +0100
Hi
Regarding this discussion. What to do with a folded piece of Vellum. It is large
sheet and it has been folded several times. I would like to have it a bit more
'unfolded' but I am anxious not to break the Vellum. It is a bit fragile on the
lines where it has been folded.
What to do ?
Joost
Manasekinc@aol.com wrote:
> Vellum (or parchment or pergamen) is an untanned sheet derived from the inner
> layer of animal hide. The epidermis is scraped off, leaving an essentially
> pure collagen fibrillar matrix that is stretched, cleaned, whitened and
> dried. Because it is stretched, t is essentially a two-dimensional matrix,
> not a true three-dimensional "feltwork"
>
> It has the property of expanding and contracting in response to changes in
> humidity. This is an integral property of the material and there is nothing
> you can do about it. I suspect that your house is dry and this has caused the
> sheet to cntract unevenly, hence the cocklling. No doubt it is held down in
> places in order to "float" it and these are stress points where strain
> resulting from dimensinal change cannot be relieved and the cockling is
> accentuated.
>
> Vellum is remarkably robust, hence its use on early bindings. If you have
> ever owned such a volume you might recall that the binding warps with the
> seasons - the same phenomenon at work here.
>
> Do not try to 'flatten' the leaf - it will do so on its own when the umidity
> goes up.
>
> Frank
>
> This mailing list is brought to you courtesy of:
> Barry Lawrence Ruderman
> Old Historic Maps & Prints
> http://www.raremaps.com/
--
Dutch Melange
Joost Backus
Nassaustraat 57
5911 BT Venlo
The Netherlands
Tel. 00-31-77-3200035
Fax. 00-31-77-3200992
E-Mail: joostb@plex.nl
Support Dutch Melange, the Dutch Java User Group.
This mailing list is brought to you courtesy of:
Barry Lawrence Ruderman
Old Historic Maps & Prints
http://www.raremaps.com/
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