Blue Lightbulb

I have never seen a lightbulb burn out this way before. The filament shredded with blue fuzz, and the blue and white material was deposited on the inside of the glass. By the color of the material, I'm guessing it's cobalt (which would likely make the white asbestos), but the filament of a lightbulb is normally tungsten. Anyway, really cool effect on the bulb.

Done