Frank, Look at the SEM image of a tungsten filament - 2nd image here
http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&doc id=Ox10wVsW9nbjvM&tbnid=9CZnSD4v8IRcxM:&ved=&url=http%3A%2F%2Fion.asu.edu%2F descript_depth.htm&ei=awCNUZ7uIKakiQKglIHgBQ&bvm=bv.46340616,d.cGE&psig=AFQj CNEe3lCkqxcRM3q-LScX1RC9BfDMcw&ust=1368281566615817 Under high magnification, you can see the "notch" which is a typical failure site, and since you removed the filament from a working bulb - it would have been easy to create a number of stress spots and notches from the removal process - which would have much higher resistance to current. -----Original Message----- From: Eugen Leitl > I tried all kinds of gasses on all sorts of filaments Got nothing then something happened with ammonia on tungsten filaments. Can you please describe the detail of your experiment, and what exactly happened? > http://pubs.rsc.org/en/content/articlelanding/1980/F1/f19807600280 > > > > > I will get to the bottom of what ever melted my wire. > > > Frank Znidarsic
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