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Re: Display of photographs



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Iona McCraith wrote:

> Divack, Alan wrote:
>
> > I have been asked to authorize the display of some oversize photographs. The
> > items would be displayed in an area with no direct sunlight, but in which
> > florescent lamps are on much of the time.
>
> Alan is quite right that display of photographs in uncontrolled lighting
> situations is not generally a good idea.  From the information given in his
> posting the photographs would be exposed to both ultra violet radiation (from
> the florescent lights and possibly some from the windows even iu it is
> indirect), but also visible light from the florescents.
>
> Alan does not indicate what type of photographs are involved (whether colour,
> black and white or what process) or how long they would be on display . None-
> the- less all photogrpahic materials will suffer some degree of  photochemical
> damage when exposed to high light levels.   The higher the light level and the
> longer the exposure the more damage.   Damage from exposure to light is
> cumulative and irreversable.  For exhibition of photographs the current
> recommended levels are 50 lux maximum and no ultraviolet or at maximum only 75
> micro watts per lumen of U.V.
>
> While I appreciate that the cost of good quality reproductions can be expensive
> , that cost should be balanced against the risk of damge to the originals.  As
> an alternative to making photographic reproductions perhaps you could
> investigate the cost of some other form of reproduction such as photocopying.
> Very good facsimiles can now be made by colour photocopiers, laser printers,
> etc. and usually at a cheaper cost than photographic copies.
>
> Iona McCraith
> Preservation Consultant
> Archives Association of Ontario
>
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Problems?  Send e-mail to Robert F Schmidt <rschmidt@lib.muohio.edu>