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RE:oxalic acid/ graphite

>Graphite could probably be acquired from a >theatrical lighting supply house 
>in the form of electrodes for carbon-arc lights
 >(very old technology 
>though, might be hard to find). Titanium is also >pretty inert, and should 
>be more durable as well as easier to find
>Just get some titanium rods, and either thread >the ends or drill and tap 
>holes in the ends (depending on the size of the >rod) to connect wires.

isn't your average pencil core simply graphite?