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A certain lack of knowledge

and perhaps too much in another field>

The 6N metals are produced by a much simpler and more inexpensive technique. Place a refined ingot in a vacuum chamber and the employ a strip heater to heat up a section at the end of the ingot to a point just below melting. Slowly move the ingot through the heater, at a very slow rate: say a few millimeters per hour. Impurities will tend to remain in the semi molten section so as the ingot reaches the end, simply cut off the last inch or so and pass the ingot through the process again. After several passes you have a 6N ingot. AJ van Den Hull and Nippon Mining (Acrotec) employ this process to achieve their 6N ingots. Equipment is still expensive, but not quite as high tech as you make it out to be. The development of the process is an outcome from the superconductor race. There, wire makes no difference also (8^).....).
Annealing is nothing new: Wire companies have been offering this for ages: they simply pass the finished wire before insulating through a neutral oxy-acetylene flame.

Stu
Stu

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