[frameconnews] Re: Museum Glass

[Sue Maltby <smaltby@chass.utoronto.ca>]

Listers:

Another word of caution.  UV filtering glass filters out the most harmful 
wavelengths of light but by no means eliminates light damage.  The
visible spectrum of light will also cause damage too just not as quickly
as the UV component.  I feel it is important to caution clients that UV
filters are not a magic bullet - they should still take care to limit the 
light exposure to light-sensitive items.

Have any of you provided protection agains UV by applying any of the UV
absorbing films (e.g., 3M)> to framing glass?  In addition to offering
protection from UV the film also provides impact protection (i.e., a
number were developed for commercial applications were "smash & grab"
theft was an issue).

Sue Maltby, Conservator
smaltby@chass.utoronto.ca


> One word of caution about Tru-Vue's museum glass. We installed it on a
> client's extremely valuable Picasso drawing and several months later
> brought it back into our framing studio for a minor adjustment. Upon
> opening the frame we found the glass had either failed or was
> defectively manufactured; the Picasso was very slightly light struck.
> Upon checking the glass with a UV monitor we found that it was not
> filtering.Unfortunately we have no way to track other pieces we may
> have framed out from the same pane.
> 
> As of that moment we now check every piece of glass we install (we use
> nothing but Museum Glass) and record the reading upon a label on the
> rear of the frame.
> To date we have not run into a defective pane coming out of the
> crate,but we truely have no way of knowing if a failure occurs later
> unless the client were to return it.
> 
> Liability issues in this type of situation always worry us deeply even
> though we have a strong hold-harmless contract with each and every
> client. However, by recording each reading both on the frame back and
> the client's folder, we feel this will go a long way toward covering us
> if a failure occurs.
> 
> 
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