On Thu, 4 Sep 2003 03:50:04 -0700, Watson A.Name - "Watt Sun"
wrote:

Underneath the glass was a thick tray with grooves
cut (or cast) into it in the shape of the letters EXIT. Each groove
had a pale yellowish rod laying in it, a bit thicker than a pencil
lead. My guess is that this is some kind of phosphorescent material
that glows when light from flames from a fire are hitting it. There
is _no_ power to the sign.


Could it have been a tritium source? I've seen them to be yellowish
glass vessels. It would be hard to see it glow without cupping your
hand over it i think.