>If you don't believe me drill a little hole=20
>through the base of a new globe and power it=20
>up and see what happens to the filament. :o)

One guy I worked with would take an MES lamp and gently squeeze it with =
a pair of pliers to crack the glass. Then apply a low voltage to it and =
the filament very slowly vaporizes leaving a white film on the glass. =
After doing this he would put it up his nose and watch the discusted =
expressions on peoples faces.

I suspect for the glass to turn black the lamp has to be at operating =
temperature and have a very minute leak.

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics