G’day;
I have used molten Sodium nitrite to point both tungsten and
molybden wire. For silver you would use warm nitric acid; and gold,
aqua regia. If you have access to a high amperage power source, I
used an electrolyte like sodium nitrate or cyanide solution to point
silver by the dipping method. Move the wire up and down to achieve
the kind of point you need. The fast-etching method is the best; you
don’t work-harden the wire
Cheers for now,
JohnB of NZ