Richard How do you fix the interior windows without damaging the historic structure (I assume that if you've got historic glass then the surrounding frame and structure are equally historic)? Also doesn't the addition of a storm window have a greater effect on the appearance of the historic building than replacing some of the historic glass with modern glass? Our experience is that if applied and removed with care by contractors who are used to working with historic glass most historic window glass is robust enough to survive the process. However for visible light I would suggest the use of blinds (or shutters if these are historically appropriate). Where the view is considered important you might consider a combination of two blinds. A semi transparent blind during opening hours which will reduce light levels but still allow the view to be appreciated and an opaque "blackout" blind for when the room is closed to the public. Trevor Reynolds Collections Registrar English Heritage, 1 Waterhouse Square, 138-142 Holborn, London, EC1N 2ST Tel 020 7973 3482 -----Original Message----- From: Museum discussion list [mailto:[log in to unmask]] On Behalf Of Richard L. Kerschner Sent: 29 January 2008 20:44 To: [log in to unmask] Subject: Re: Blocking Visible Light to Galleries I am not a fan of tinted or UV films applied directly to windowpanes. Many degrade after 8 years or so and the tinting fades away even sooner, especially in south windows. They are difficult to remove and for that reason should not be applied to old glass windows of hsitoric houses. For blocking UV and visible light, I always recommend more permanent interior storm windows _________________________________________________________________________________ This e-mail (and any attachments) is confidential and may contain personal views which are not the views of English Heritage unless specifically stated. If you have received it in error, please delete it from your system and notify the sender immediately. Do not use, copy or disclose the information in any way nor act in reliance on it. Any information sent to English Heritage may become publicly available. ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).