This is a difficult question to answer verbally. I have done a lot of work
on 16th centruy ventian glass which is gilt and it leaves the same matt
surface texture as mirror backing. It really is a matter of once you have
seen it it is very distinctive.

paul courtney


----- Original Message -----
From: "Nancy O'Malley" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 30, 2001 4:35 PM
Subject: Re: miror glass


> What is the characteristic surface texture? And how might it be affected
by
> the weathering of glass in various soils? I have never been fortunate
> enough to find anything bevelled..
>
> At 03:58 PM 11/30/2001 +0000, you wrote:
> >In my experience (in Britain) mirror glass of this date is usually clear
and
> >can be recognised by bevelled edges if you are lucky or by the
> >characteristic surface texture where the backing has been. It also tends
to
> >be slightly on the thick side but I don't know of any ststistical study.
> >
> >paul courtney
> >leicester UK
> >
> >----- Original Message -----
> >From: "Nancy O'Malley" <[log in to unmask]>
> >To: <[log in to unmask]>
> >Sent: Friday, November 30, 2001 1:48 PM
> >
> >
> > > What about mirror glass? 18th century sites in Kentucky usually have
very
> > > small quantities of glass of any kind, but a few fragments of flat
glass
> > > (usually clear or light green) occasionally turn up. Probate
inventories
> >of
> > > the time period often mention "looking glasses" as one of the very few
> > > glass items in the household. Since the backing has never been
preserved
> >on
> > > any of the very few flat glass artifacts I have from undisputed late
18th
> > > century sites, I have never been comfortable making an unequivocal
i.d.
> >for
> > > mirror glass but it seems like a distinct possibility to me. Does
anyone
> > > know of any thickness data taken on 18th century and later mirrors?
> > >
> > > At 11:03 AM 11/29/2001 -0800, you wrote:
> > > >Window glass from the 18th century tends to be clear/aqua colored and
> >very
> > > >thin. I vote for the case bottle.
> > > >
> > > >
> > > >At 11:25 AM 11/29/01 -0500, you wrote:
> > > > >If I have a piece of flat green glass from a 18th century historic
> >site.
> > > > >How do I know if it is window glass or a fragment of case bottle?
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >Roberta Charpentier
> > > > >Archaeology Lab Supervisor
> > > > >Mashantucket Pequot Museum and Research Center
> > > > >110 Pequot Trail
> > > > >Mashantucket, CT  06339
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> > > > >Phone:  860-396-6936
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> > > >
> > > >
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