While I have not been able to find any peer-reviewed published studies of the effects of laser pointers on artworks, several informal observations and studies have been discussed in the Conservation DistList (searchable archives available at http://palimpsest.stanford.edu/byform/mailing-lists/cdl/search.html). The consensus among conservators on the list was that because the laser is only on a specific spot for a very brief time, because the red light is at the least-damaging end of the spectrum, and because pointing closely with a finger or telescoping stick was more obviously risky, it's okay for docents to use laser pointers in galleries. We allow our docents to use red laser pointers, but not the new extra-powerful green ones.
One poster to the Conservation DistList in 1999 included excerpts from the then-current Boston Museum of Fine Arts policy document on laser pointers, including "The most common laser pointers currently on the market are 'Class IIIA,' meaning that they have a moderate power output (1-5 mW). Of the red light pointers, the least expensive and most readily available emit 670 nanometer light. Only red light lasers of Class IIIA' or below should be utilized. If possible, 'Class II' red light lasers should be used; these are safer than 'Class IIIA' types, but may not have sufficient intensity for use in galleries."
Hope this helps.
Erin.
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Erin C. Blake, Ph.D.
Curator of Art & Special Collections
Folger Shakespeare Library
201 E. Capitol St. SE
Washington, DC 20003-1094
office tel. (202) 675-0323
fax: (202) 675-0328
e-mail: [log in to unmask]
www.folger.edu
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