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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?