Lisa;
Don't forget, even with 99% UV protection, any light will cause damage,
and the damage is both cumulative and irreversible. Visible light will
bleach, yellow or darken just about any pigment; visible light and the
associated heat will also provide energy to the chemical reactions that
cause deterioration, speeding up the break-down of anything the light
falls on.
This is not to say that blocking out the UV is a bad idea--it just
isn't all that you need to consider, and that "maximizing the light" may
not be appropriate if you are using that space for artefact exhibition.
Here's some websites on the harmful nature of any light;
Northeast Document Conservation Center
http://www.nedcc.org/plam3/tleaf24.htm
U.S. National Park Service Technical Preservation Services for Historic
Buildings
http://www.cr.nps.gov/hps/tps/technotes/PTN30/introduction.htm
The McMichaeal Canadian Art Collection
http://www.mcmichael.com/artlight1.htm
The Northern States Conservation Centre
http://www.collectioncare.org/cci/cciel.html
The Science Museum of Minnesota
http://www.smm.org/research/Conservation/agents/light.php
Cheers,
------------------------------------------------------------
Tim McShane, Assistant--Cultural History
Medicine Hat Museum and Art Gallery
1302 Bomford Crescent S.W.
Medicine Hat, AB T1A 5E6
Tel: (403) 502-8587
[log in to unmask]
>>> [log in to unmask] 07/27/05 12:22 PM >>>
What about reducing the UV with window film then you don't have to
worry
about the shades doing the job for you. Check out Llumar films which
claim "Depending on the film selected, LLumar can cut from 12 to 93
percent of incoming light, eliminate 99% of the harmful ultraviolet
radiation
to protect fabrics and finishes, block 92% of glare and cut up to 76%
of
solar heat gain through the glass." The web address for US
architectural films is
http://www.llumar.com/na-eng/Architectural/building.html. The plant
is
in our town and the CEO has told me that they feel they block 100% of
UV
but they don't claim it because it is possible to have tiny holes in
the
film that render it 99%. He said they sell quite a bit of it for
people
who cannot be exposed to UV at all and have to have their windows
filmed, can only go out at night in the dark, etc.
Elizabeth
-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]] On
Behalf Of Lisa Renken
Sent: Wednesday, July 27, 2005 2:13 PM
To: [log in to unmask]
Subject: Window Shades For A 1910 Structure
Our small cultural history museum is housed in a former Carnegie
Library
building built in 1910. Sometime in the last 20 - 30 years someone
replaced the original white shades with dark brown miniblinds. The
effect
is to make the windows look like dark holes from the outside and hide
much
of the beautiful original window framing on the inside. Although the
entire building is in need of refurbishment (a project we hope to take
on
in the near future in conjunction with the city who owns the
building),
we
think changing the miniblinds with white shades appropriate to the
buiding's 1910 period of construction would go along way toward
improving
the appearance and authenticity of the building.
I am asking for help in my research for the appropriate shades. I
would
like to minimize the amount of harmful uv rays coming into the
building
while maximizing the light. Any references or sources as to all
conservation considerations and vendors will be greatly appreciated.
Thanks in advance.
Lisa Renken
Director
Lompoc Museum
805-736-3888 (Phone)
805-736-2840 (FAX)
200 South H Street
Lompoc, CA 93436
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