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Oooh! An infra-red heat gun (love techy things, typical man!) Seriously, many thanks Emily, either of those hot ideas might well work. Next time I have a case with puttied glass, there MAY be less swearing than usual. With all good wishes, Simon Moore, MIScT, FLS, ACR, Senior Conservator of Natural Sciences. Hampshire County Council, Department of Culture, Communities and Rural Affairs, Museums & Archives Service, Chilcomb House, Chilcomb Lane, Winchester SO23 8RD. UK. Internal 8 327 6737 01962 826737 http://www.hants.gov.uk/museum/biology -----Original Message----- From: The Natural Science Collections Association discussion list [mailto:[log in to unmask]] On Behalf Of Emily Mayer Sent: 28 August 2009 18:01 To: [log in to unmask] Subject: Re: Old Putty Here's an idea..maybe http://www.freepatentsonline.com/4582540.html Another heat source which might work better than a solder iron is a heat gun - one with temperature control. If you warm the glass first (maybe keep a fan heater on it?) then you won't have the hot/cold shock factor which is likely to make the glass crack. Steinel make very good electronic variable temp. controlled guns.