How to Sharpen tungsten needles?
jb031504 at mbcr.bcm.tmc.edu
Thu Jun 16 18:00:48 EST 1994
In article <2tq19m$mis at usenet.srv.cis.pitt.edu>, lxzst+ at pitt.edu
> I need to sharpen tungsten needles for dissecting the flies. I was told
> that there is a chemical way to do this. Does anyone know the recipe?
> Any advice will be much appreciated.
Fix a length (5 cm) of 0.4 mm dia. tungsten wire to the end of pasteur
pipette or glass rod by melting the end of the rod in a burner first. Next,
heat sodium nitrite in a nickel crucible over a bunsen burner until it is
molten. Dip the wire repeatedly in the nickel and remove it quickly.
Examine the wire under a dissecting scope and repeat dipping until the
desired point is acheived. The end of the wire is dissolved in the sodium
nitrite--since the tip is immersed longer, it is dissolved more, forming a
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