Vibe wrote:The "filament" is nothing magical - it's a ceramic tube that contained the sodium required for the sodium vapor lamp to work, As such there are electrodes at each end that attach it to, and must be separated from, the lamp assembly. You do have to break the glass globe to get to it. But it's the ceramic that has the texture and hardness required to move/remove the blades metal and form the edge. Since there is really no reason for the texture to be of a particular grade for it's intended purpose, some may end up being more or less aggressive as a stone than others.
Unique information there Vibe, thanks!!! Very interesting
Sodium, isn't that the metal that burns in water? That's the pyro in me having a flash back